Berkhamsted Circular Walk

A short easy walk to the South-East of Berkhamsted, along the Grand Union Canal and across fields to Ashley Green for lunch, returning via Hockeridge Wood.

Hiking weather forecast

Hertfordshire hourly weather (Visual Crossing)

Sunset: 16:02. Dusk: 16:42. Dark: 17:25. Moon 11% (dusk to 18:55)

Updated: Thu, 02-Jan at 11:39

06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
Today 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Fri, 03 Jan 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Sat, 04 Jan 0% 7% 7% 7% 7% 7% 7% 65% 65% 65% 65% 65% 65% 97% 97% 97%
Sun, 05 Jan 100% 97% 97% 97% 97% 97% 97% 81% 81% 81% 81% 81% 81% 71% 71% 71%
Mon, 06 Jan 68% 55% 55% 55% 55% 55% 55% 39% 39% 39% 39% 39% 39% 16% 16% 🌫 16%
Tue, 07 Jan 32% 16% 16% 🌫 16% 🌫 16% 16% 16% 16% 16% 16% 16% 16% 16% 16% 16% 16%
Wed, 08 Jan 13% 19% 19% 19% 19% 19% 19% 23% 23% 23% 23% 23% 23% 26% 26% 26%
Thu, 09 Jan 19% 16% 16% 16% 16% 16% 16% 23% 23% 23% 23% 23% 23% 29% 29% 29%
Fri, 10 Jan 39% 45% 45% 45% 45% 45% 45% 39% 39% 39% 39% 39% 39% 19% 19% 19%
Sat, 11 Jan 23% 19% 19% 19% 19% 19% 19% 13% 13% 13% 13% 13% 13% 13% 13% 13%
Sun, 12 Jan 19% 26% 26% 26% 26% 26% 26% 32% 32% 32% 32% 32% 32% 19% 19% 19%
Mon, 13 Jan 26% 26% 26% 26% 26% 26% 26% 16% 16% 16% 16% 16% 16% 13% 13% 13%
Tue, 14 Jan 13% 10% 10% 10% 10% 10% 10% 23% 23% 23% 23% 23% 23% 16% 16% 16%
Wed, 15 Jan 10% 23% 23% 23% 23% 23% 23% 23% 23% 23% 23% 23% 23% 16% 16% 16%
Thu, 16 Jan 10% 7% 7% 7% 7% 7% 7% 10% 10% 10% 10% 10% 10% 16% 16% 16%

Percentages are the chance of rain.

Weather data by Visual Crossing

Hertfordshire hourly weather (Open Meteo)

Sunset: 16:02. Dusk: 16:42. Dark: 17:25. Moon 11% (dusk to 18:55)

Updated: Thu, 02-Jan at 11:36

06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
Today 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Fri, 03 Jan 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Sat, 04 Jan 0% 0% 0% 0% 0% 0% 0% 0% 1% 3% 6% 11% 15% 17% 18% 23%
Sun, 05 Jan 85% 87% 88% 88% 87% 85% 83% 79% 74% 68% 62% 57% 53% 51% 50% 51%
Mon, 06 Jan 63% 63% 63% 63% 63% 61% 60% 58% 55% 52% 49% 46% 43% 40% 37% 34%
Tue, 07 Jan 13% 19% 18% 17% 17% 16% 15% 14% 14% 13% 12% 12% 11% 11% 11% 10%
Wed, 08 Jan 12% 12% 13% 13% 14% 14% 15% 16% 16% 17% 18% 19% 20% 21% 22% 23%
Thu, 09 Jan 30% 30% 31% 32% 32% 33% 33% 18% 17% 16% 15% 15% 16% 19% 23% 26%
Fri, 10 Jan 42% 44% 47% 48% 46% 42% 39% 37% 35% 32% 28% 23% 19% 16% 14% 13%
Sat, 11 Jan 26% 25% 22% 19% 18% 17% 16% 15% 14% 13% 11% 8% 6% 7% 8% 10%
Sun, 12 Jan 19% 21% 22% 24% 26% 27% 29% 30% 31% 32% 33% 33% 32% 29% 26% 22%
Mon, 13 Jan 26% 27% 28% 28% 28% 27% 26% 24% 21% 18% 15% 12% 10% 9% 9% 9%
Tue, 14 Jan 13% 13% 12% 11% 10% 10% 10% 12% 14% 17% 19% 22% 23% 23% 22% 21%
Wed, 15 Jan 13% 14% 16% 18% 20% 22% 23% 24% 24% 24% 24% 24% 23% 22% 20% 18%
Thu, 16 Jan 10% 9% 9% 8% 7% 7% 6% 6% 5% 5% 5% 5% 6% 7% 9% 10%
Fri, 17 Jan 13% 14% 15% 16% 17% 18% 19% 18% 17% 16% 15% 14% 13% 14% 15% 16%

Percentages are the chance of rain.

Weather data by Open-Meteo

Hertfordshire hourly weather (Met Office)

Sunset: 16:02. Dusk: 16:42. Dark: 17:25. Moon 11% (dusk to 18:55)

Updated: Thu, 02-Jan at 11:00

06 09 12 15 18 21
Today 0% 0% 0% 0%
Fri, 03 Jan 0% 0% 1% 1% 2% 1%
Sat, 04 Jan 6% 6% 5% 7% 10% 81%
Sun, 05 Jan 63% 58% 51% 45% 52% 41%
Mon, 06 Jan 55% 51% 19% 13% 10% 14%
Tue, 07 Jan 6% 4% 3% 7% 6% 8%
Wed, 08 Jan 10% 12% 13% 14% 14% 13%
Thu, 09 Jan 12% 14%

Percentages are the chance of rain.

Weather data by Met Office

Regional weather (Met Office)

Sunset: 16:02. Dusk: 16:42. Dark: 17:25. Moon 11% (dusk to 18:55)

Updated: Thu, 02-Jan at 11:38

East England

Feeling much colder everywhere. Scattered wintry showers for East Anglia.

  • Feeling much colder everywhere
  • Scattered blustery, sometimes heavy, wintry showers will move across Norfolk and Suffolk, with some showers reaching Essex and Cambridgeshire, with sunny spells in-between
  • Elsewhere dry and largely sunny
  • Windy for many coastal areas
  • Maximum Temperature 5C

Tonight:

  • This evening the coastal showers will die away, leaving everywhere dry and largely clear overnight with light winds
  • A widespread frost will quickly develop, locally severe
  • Minimum Temperature -4C

Friday:

  • Areas of cloud will spread south bringing scattered wintry showers, although these mainly to coastal areas
  • Some sunny spells will develop through the afternoon
  • Feeling very cold everywhere
  • Maximum Temperature 3C

Outlook for Saturday to Monday:

  • Saturday frosty start then becoming cloudy, with rain or snow, arriving later
  • Sunday probably milder, windy with spells of rain
  • Monday windy, turning colder with rain or showers

UK Day 6-7 and week 2

  • Much of this period is likely to remain colder than average, with an ongoing risk of ice and frost
  • There will also likely be wintry or snow showers at times along coastal areas exposed to onshore winds, these occasionally feeding farther inland, but interspersed with some lengthy dry and clear spells
  • Some longer spells of rain, with some sleet and snow possible, may push into southern areas in particular as Atlantic frontal systems attempt to make some progress into the UK, perhaps also introducing something briefly milder
  • Towards mid-January there may be a trend towards less-cold conditions more generally, but perhaps with high pressure nearby which could provide fairly settled conditions with an increasing chance of fog

UK Week 3 and 4

  • Slowly-evolving weather patterns look most likely through the second half of January, with high pressure often in the vicinity of the UK, although the flavour of the weather we experience depends on where the high and low pressure centres are relative to the UK
  • There are currently no strong signals for prolonged cold but spells of cold weather are likely, with frost, fog, and wintry showers
  • Pulses of more unsettled weather are more likely across the south than the north, and may bring milder conditions for a time too

Weather data by Met Office

Hertfordshire Air Quality (Pollen and UV)

Updated: Thu, 02-Jan at 11:36

Key : Low Medium High Very High

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Today air q UV air q UV air q UV air q UV air q UV air q   air q   air q   air q   air q   air q   air q   air q  
Fri, 03 Jan air q   air q   air q   air q   air q   air q   air q   air q   air q   air q UV air q UV air q UV air q UV air q UV air q UV air q UV air q   air q   air q   air q   air q   air q   air q   air q  
Sat, 04 Jan air q   air q   air q   air q   air q   air q   air q   air q   air q   air q UV air q UV air q UV air q UV air q UV air q UV air q UV air q   air q   air q   air q   air q   air q   air q   air q  
Sun, 05 Jan air q   air q   air q   air q   air q   air q   air q   air q   air q   air q UV air q UV air q UV air q UV air q UV air q UV air q UV air q   air q   air q   air q   air q   air q   air q   air q  

Pollens

These pollens are shown (in season):

  • Grass
  • Alder and birch (trees)
  • Mugwort and Ragweed (weeds)

When out walking, wraparound glasses, a disposable or washable facemask, and being at the front of the group, all help.

Other forecasts: Met Office, University of Worcester

UV and Air Quality

The UV forecast takes account of cloud cover.

"Air Q", the European Air Quality index, is a mix of dust/particulates, ozone, sulphur and nitrous oxides

Data

Weather data by Open-Meteo and CAMS ENSEMBLE

Hertfordshire Visibility

Updated: Thu, 02-Jan at 11:36

06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
Today 23km 33km 42km 51km 52km 47km 42km 30km 31km 28km 26km
Fri, 03 Jan 17km 21km 26km 33km 39km 44km 45km 47km 46km 41km 32km 28km 27km 25km 24km 25km
Sat, 04 Jan 14km 15km 17km 18km 22km 20km 31km 36km 44km 43km 39km 27km 18km 14km 15km 27km
Sun, 05 Jan 3km 2km 1km 1km 0km 0km 0km 0km 0km 1km 4km 7km 10km 12km 14km 16km
Mon, 06 Jan 12km 13km 14km 14km 19km 24km 28km 30km 31km 33km 27km 22km 17km 16km 14km 13km

Visibility in km. Above 50km is 'good'. Humidity and air pollution make it worse. Theoretical maximum is 300km/200 miles in clean dry polar air.

On the South Downs, at ~ 170m/500ft, the horizon is is ~ 45km/30 miles away. On a mountain at 1,000m/3,000ft, it is ~ 160km/100 miles away. Formula: horizon in km = √ (13 x altitude in m)

Weather data by Open-Meteo

Hertfordshire daylight

Date Light Dawn Sunrise Max Ht. Sunset Dusk Dark Day Length
Thu, 02-Jan 06:44 07:27 08:07 12:05 16:02 16:42 17:25 09:14
Fri, 03-Jan 06:44 07:27 08:07 12:05 16:03 16:43 17:26 09:16
Sat, 04-Jan 06:44 07:27 08:07 12:06 16:04 16:44 17:27 09:17
Sun, 05-Jan 06:44 07:27 08:07 12:06 16:06 16:46 17:29 09:18
Mon, 06-Jan 06:44 07:26 08:06 12:06 16:07 16:47 17:30 09:20
Tue, 07-Jan 06:43 07:26 08:06 12:07 16:08 16:48 17:31 09:21
Wed, 08-Jan 06:43 07:26 08:05 12:07 16:09 16:49 17:32 09:23
Thu, 09-Jan 06:43 07:25 08:05 12:08 16:11 16:50 17:33 09:25
Fri, 10-Jan 06:42 07:25 08:04 12:08 16:12 16:52 17:34 09:26
Sat, 11-Jan 06:42 07:24 08:04 12:08 16:14 16:53 17:36 09:28
Sun, 12-Jan 06:41 07:24 08:03 12:09 16:15 16:54 17:37 09:30
Mon, 13-Jan 06:41 07:23 08:02 12:09 16:17 16:56 17:38 09:32
Tue, 14-Jan 06:40 07:22 08:01 12:10 16:18 16:57 17:39 09:34
Wed, 15-Jan 06:40 07:22 08:01 12:10 16:20 16:59 17:41 09:36
Thu, 16-Jan 06:39 07:21 08:00 12:10 16:21 17:00 17:42 09:39
Fri, 17-Jan 06:38 07:20 07:59 12:11 16:23 17:02 17:44 09:41
Sat, 18-Jan 06:37 07:19 07:58 12:11 16:25 17:03 17:45 09:43
Sun, 19-Jan 06:37 07:18 07:57 12:11 16:26 17:05 17:46 09:46
Mon, 20-Jan 06:36 07:17 07:56 12:12 16:28 17:06 17:48 09:48
Tue, 21-Jan 06:35 07:16 07:54 12:12 16:30 17:08 17:49 09:51
Wed, 22-Jan 06:34 07:15 07:53 12:12 16:31 17:09 17:51 09:53
Thu, 23-Jan 06:33 07:14 07:52 12:12 16:33 17:11 17:52 09:56
Fri, 24-Jan 06:32 07:13 07:51 12:13 16:35 17:12 17:54 09:59
Sat, 25-Jan 06:31 07:12 07:50 12:13 16:37 17:14 17:55 10:01
Sun, 26-Jan 06:30 07:11 07:48 12:13 16:38 17:16 17:57 10:04
Mon, 27-Jan 06:29 07:10 07:47 12:13 16:40 17:17 17:58 10:07
Tue, 28-Jan 06:28 07:08 07:45 12:13 16:42 17:19 18:00 10:10
Wed, 29-Jan 06:26 07:07 07:44 12:14 16:44 17:21 18:01 10:13
Thu, 30-Jan 06:25 07:06 07:42 12:14 16:46 17:22 18:03 10:16
Fri, 31-Jan 06:24 07:04 07:41 12:14 16:47 17:24 18:05 10:19
Sat, 01-Feb 06:23 07:03 07:39 12:14 16:49 17:26 18:06 10:22
Sun, 02-Feb 06:21 07:02 07:38 12:14 16:51 17:27 18:08 10:25
Mon, 03-Feb 06:20 07:00 07:36 12:14 16:53 17:29 18:09 10:29
Tue, 04-Feb 06:18 06:59 07:35 12:14 16:55 17:31 18:11 10:32
Wed, 05-Feb 06:17 06:57 07:33 12:14 16:57 17:33 18:13 10:35
Thu, 06-Feb 06:15 06:55 07:31 12:15 16:59 17:34 18:14 10:38
Fri, 07-Feb 06:14 06:54 07:29 12:15 17:00 17:36 18:16 10:42
Sat, 08-Feb 06:12 06:52 07:28 12:15 17:02 17:38 18:18 10:45
Sun, 09-Feb 06:11 06:50 07:26 12:15 17:04 17:40 18:19 10:49
Mon, 10-Feb 06:09 06:49 07:24 12:15 17:06 17:41 18:21 10:52
Tue, 11-Feb 06:08 06:47 07:22 12:15 17:08 17:43 18:23 10:56
Wed, 12-Feb 06:06 06:45 07:20 12:15 17:10 17:45 18:24 10:59
Thu, 13-Feb 06:04 06:44 07:18 12:15 17:12 17:47 18:26 11:03
Fri, 14-Feb 06:02 06:42 07:17 12:15 17:13 17:48 18:28 11:06
Sat, 15-Feb 06:01 06:40 07:15 12:15 17:15 17:50 18:29 11:10
Sun, 16-Feb 05:59 06:38 07:13 12:14 17:17 17:52 18:31 11:13
Mon, 17-Feb 05:57 06:36 07:11 12:14 17:19 17:54 18:33 11:17
Tue, 18-Feb 05:55 06:34 07:09 12:14 17:21 17:55 18:34 11:21
Wed, 19-Feb 05:53 06:32 07:07 12:14 17:23 17:57 18:36 11:24
Thu, 20-Feb 05:51 06:30 07:05 12:14 17:24 17:59 18:38 11:28
Fri, 21-Feb 05:49 06:28 07:03 12:14 17:26 18:01 18:40 11:32
Sat, 22-Feb 05:47 06:26 07:01 12:14 17:28 18:02 18:41 11:35
Sun, 23-Feb 05:45 06:24 06:58 12:14 17:30 18:04 18:43 11:39
Mon, 24-Feb 05:43 06:22 06:56 12:14 17:32 18:06 18:45 11:43
Tue, 25-Feb 05:41 06:20 06:54 12:13 17:34 18:08 18:46 11:47
Wed, 26-Feb 05:39 06:18 06:52 12:13 17:35 18:09 18:48 11:51
Thu, 27-Feb 05:37 06:16 06:50 12:13 17:37 18:11 18:50 11:54
Fri, 28-Feb 05:35 06:14 06:48 12:13 17:39 18:13 18:52 11:58
Sat, 01-Mar 05:33 06:12 06:46 12:13 17:41 18:14 18:53 12:02
Sun, 02-Mar 05:31 06:10 06:43 12:13 17:43 18:16 18:55 12:06
Mon, 03-Mar 05:29 06:08 06:41 12:12 17:44 18:18 18:57 12:10
Tue, 04-Mar 05:27 06:05 06:39 12:12 17:46 18:20 18:59 12:14
Wed, 05-Mar 05:24 06:03 06:37 12:12 17:48 18:21 19:00 12:18
Thu, 06-Mar 05:22 06:01 06:35 12:12 17:50 18:23 19:02 12:22
Fri, 07-Mar 05:20 05:59 06:32 12:11 17:51 18:25 19:04 12:26
Sat, 08-Mar 05:18 05:57 06:30 12:11 17:53 18:27 19:06 12:29
Sun, 09-Mar 05:16 05:54 06:28 12:11 17:55 18:28 19:07 12:33
Mon, 10-Mar 05:13 05:52 06:26 12:11 17:57 18:30 19:09 12:37
Tue, 11-Mar 05:11 05:50 06:23 12:10 17:58 18:32 19:11 12:41
Wed, 12-Mar 05:09 05:48 06:21 12:10 18:00 18:34 19:13 12:45
Thu, 13-Mar 05:06 05:45 06:19 12:10 18:02 18:35 19:15 12:49
Fri, 14-Mar 05:04 05:43 06:17 12:10 18:04 18:37 19:16 12:53
Sat, 15-Mar 05:02 05:41 06:14 12:09 18:05 18:39 19:18 12:57
Sun, 16-Mar 04:59 05:39 06:12 12:09 18:07 18:41 19:20 13:02
Mon, 17-Mar 04:57 05:36 06:10 12:09 18:09 18:42 19:22 13:06
Tue, 18-Mar 04:55 05:34 06:07 12:08 18:11 18:44 19:24 13:10
Wed, 19-Mar 04:52 05:32 06:05 12:08 18:12 18:46 19:25 13:14
Thu, 20-Mar 04:50 05:29 06:03 12:08 18:14 18:48 19:27 13:18
Fri, 21-Mar 04:47 05:27 06:00 12:08 18:16 18:49 19:29 13:22
Sat, 22-Mar 04:45 05:25 05:58 12:07 18:17 18:51 19:31 13:26
Sun, 23-Mar 04:42 05:22 05:56 12:07 18:19 18:53 19:33 13:30
Mon, 24-Mar 04:40 05:20 05:54 12:07 18:21 18:55 19:35 13:34
Tue, 25-Mar 04:37 05:18 05:51 12:06 18:22 18:56 19:37 13:38
Wed, 26-Mar 04:35 05:15 05:49 12:06 18:24 18:58 19:39 13:42
Thu, 27-Mar 04:32 05:13 05:47 12:06 18:26 19:00 19:40 13:46
Fri, 28-Mar 04:30 05:10 05:44 12:05 18:28 19:02 19:42 13:51
Sat, 29-Mar 04:27 05:08 05:42 12:05 18:29 19:03 19:44 13:55
Sun, 30-Mar 05:25 06:06 06:40 13:05 19:31 20:05 20:46 13:59
Mon, 31-Mar 05:22 06:03 06:37 13:05 19:33 20:07 20:48 14:03
Tue, 01-Apr 05:20 06:01 06:35 13:04 19:34 20:09 20:50 14:07
Wed, 02-Apr 05:17 05:59 06:33 13:04 19:36 20:10 20:52 14:11
Thu, 03-Apr 05:15 05:56 06:31 13:04 19:38 20:12 20:54 14:15
Fri, 04-Apr 05:12 05:54 06:28 13:03 19:40 20:14 20:56 14:20
Sat, 05-Apr 05:10 05:52 06:26 13:03 19:41 20:16 20:58 14:24
Sun, 06-Apr 05:07 05:49 06:24 13:03 19:43 20:18 21:00 14:28
Mon, 07-Apr 05:05 05:47 06:22 13:03 19:45 20:19 21:02 14:32
Tue, 08-Apr 05:02 05:44 06:19 13:02 19:46 20:21 21:04 14:36
Wed, 09-Apr 04:59 05:42 06:17 13:02 19:48 20:23 21:06 14:40
Thu, 10-Apr 04:57 05:40 06:15 13:02 19:50 20:25 21:08 14:45
Fri, 11-Apr 04:54 05:37 06:13 13:01 19:51 20:27 21:10 14:49
Sat, 12-Apr 04:52 05:35 06:10 13:01 19:53 20:29 21:12 14:53
Sun, 13-Apr 04:49 05:33 06:08 13:01 19:55 20:30 21:14 14:57
Mon, 14-Apr 04:46 05:30 06:06 13:01 19:56 20:32 21:17 15:01
Tue, 15-Apr 04:44 05:28 06:04 13:00 19:58 20:34 21:19 15:05
Wed, 16-Apr 04:41 05:26 06:02 13:00 20:00 20:36 21:21 15:10
Thu, 17-Apr 04:39 05:24 06:00 13:00 20:02 20:38 21:23 15:14
Fri, 18-Apr 04:36 05:21 05:57 13:00 20:03 20:40 21:25 15:18
Sat, 19-Apr 04:33 05:19 05:55 13:00 20:05 20:41 21:27 15:22
Sun, 20-Apr 04:31 05:17 05:53 12:59 20:07 20:43 21:30 15:26
Mon, 21-Apr 04:28 05:14 05:51 12:59 20:08 20:45 21:32 15:30
Tue, 22-Apr 04:26 05:12 05:49 12:59 20:10 20:47 21:34 15:34
Wed, 23-Apr 04:23 05:10 05:47 12:59 20:12 20:49 21:36 15:39
Thu, 24-Apr 04:20 05:08 05:45 12:59 20:13 20:51 21:38 15:43
Fri, 25-Apr 04:18 05:05 05:43 12:58 20:15 20:53 21:41 15:47
Sat, 26-Apr 04:15 05:03 05:41 12:58 20:17 20:55 21:43 15:51
Sun, 27-Apr 04:13 05:01 05:39 12:58 20:18 20:56 21:45 15:55
Mon, 28-Apr 04:10 04:59 05:37 12:58 20:20 20:58 21:48 15:59
Tue, 29-Apr 04:08 04:57 05:35 12:58 20:22 21:00 21:50 16:03
Wed, 30-Apr 04:05 04:55 05:33 12:58 20:23 21:02 21:52 16:07
Thu, 01-May 04:02 04:52 05:31 12:58 20:25 21:04 21:54 16:11
Fri, 02-May 04:00 04:50 05:29 12:57 20:27 21:06 21:57 16:15
Sat, 03-May 03:57 04:48 05:27 12:57 20:28 21:08 21:59 16:19
Sun, 04-May 03:55 04:46 05:25 12:57 20:30 21:10 22:02 16:23
Mon, 05-May 03:52 04:44 05:24 12:57 20:32 21:11 22:04 16:27
Tue, 06-May 03:50 04:42 05:22 12:57 20:33 21:13 22:06 16:31
Wed, 07-May 03:47 04:40 05:20 12:57 20:35 21:15 22:09 16:34
Thu, 08-May 03:45 04:38 05:18 12:57 20:37 21:17 22:11 16:38
Fri, 09-May 03:42 04:36 05:17 12:57 20:38 21:19 22:13 16:42
Sat, 10-May 03:40 04:34 05:15 12:57 20:40 21:21 22:16 16:46
Sun, 11-May 03:37 04:32 05:13 12:57 20:41 21:22 22:18 16:50
Mon, 12-May 03:35 04:31 05:12 12:57 20:43 21:24 22:21 16:53
Tue, 13-May 03:33 04:29 05:10 12:57 20:44 21:26 22:23 16:57
Wed, 14-May 03:30 04:27 05:09 12:57 20:46 21:28 22:25 17:00
Thu, 15-May 03:28 04:25 05:07 12:57 20:48 21:30 22:28 17:04
Fri, 16-May 03:25 04:23 05:06 12:57 20:49 21:31 22:30 17:07
Sat, 17-May 03:23 04:22 05:04 12:57 20:51 21:33 22:32 17:11
Sun, 18-May 03:21 04:20 05:03 12:57 20:52 21:35 22:35 17:14
Mon, 19-May 03:19 04:18 05:01 12:57 20:53 21:37 22:37 17:18
Tue, 20-May 03:16 04:17 05:00 12:57 20:55 21:38 22:40 17:21
Wed, 21-May 03:14 04:15 04:59 12:57 20:56 21:40 22:42 17:24
Thu, 22-May 03:12 04:14 04:58 12:57 20:58 21:42 22:44 17:27
Fri, 23-May 03:10 04:12 04:56 12:57 20:59 21:43 22:46 17:30
Sat, 24-May 03:08 04:11 04:55 12:57 21:00 21:45 22:49 17:33
Sun, 25-May 03:06 04:10 04:54 12:57 21:02 21:46 22:51 17:36
Mon, 26-May 03:04 04:08 04:53 12:58 21:03 21:48 22:53 17:39
Tue, 27-May 03:02 04:07 04:52 12:58 21:04 21:49 22:55 17:42
Wed, 28-May 03:00 04:06 04:51 12:58 21:05 21:51 22:58 17:45
Thu, 29-May 02:58 04:04 04:50 12:58 21:07 21:52 23:00 17:47
Fri, 30-May 02:56 04:03 04:49 12:58 21:08 21:54 23:02 17:50
Sat, 31-May 02:54 04:02 04:48 12:58 21:09 21:55 23:04 17:52
Sun, 01-Jun 02:53 04:01 04:47 12:58 21:10 21:56 23:06 17:55
Mon, 02-Jun 02:51 04:00 04:46 12:59 21:11 21:58 23:08 17:57
Tue, 03-Jun 02:49 03:59 04:46 12:59 21:12 21:59 23:10 17:59
Wed, 04-Jun 02:48 03:58 04:45 12:59 21:13 22:00 23:11 18:01
Thu, 05-Jun 02:46 03:58 04:44 12:59 21:14 22:01 23:13 18:03
Fri, 06-Jun 02:45 03:57 04:44 12:59 21:15 22:02 23:15 18:05
Sat, 07-Jun 02:44 03:56 04:43 12:59 21:16 22:03 23:16 18:07
Sun, 08-Jun 02:42 03:55 04:43 13:00 21:17 22:04 23:18 18:08
Mon, 09-Jun 02:41 03:55 04:42 13:00 21:18 22:05 23:19 18:10
Tue, 10-Jun 02:40 03:54 04:42 13:00 21:18 22:06 23:21 18:11
Wed, 11-Jun 02:39 03:54 04:42 13:00 21:19 22:07 23:22 18:13
Thu, 12-Jun 02:39 03:54 04:41 13:00 21:20 22:08 23:23 18:14
Fri, 13-Jun 02:38 03:53 04:41 13:01 21:20 22:08 23:24 18:15
Sat, 14-Jun 02:37 03:53 04:41 13:01 21:21 22:09 23:25 18:16
Sun, 15-Jun 02:37 03:53 04:41 13:01 21:21 22:10 23:26 18:16
Mon, 16-Jun 02:36 03:53 04:41 13:01 21:22 22:10 23:27 18:17
Tue, 17-Jun 02:36 03:53 04:41 13:01 21:22 22:11 23:27 18:18
Wed, 18-Jun 02:36 03:53 04:41 13:02 21:23 22:11 23:28 18:18
Thu, 19-Jun 02:36 03:53 04:41 13:02 21:23 22:11 23:28 18:18
Fri, 20-Jun 02:36 03:53 04:41 13:02 21:23 22:12 23:29 18:18
Sat, 21-Jun 02:36 03:53 04:41 13:02 21:23 22:12 23:29 18:18
Sun, 22-Jun 02:36 03:53 04:42 13:03 21:23 22:12 23:29 18:18
Mon, 23-Jun 02:37 03:53 04:42 13:03 21:24 22:12 23:29 18:18
Tue, 24-Jun 02:37 03:54 04:42 13:03 21:24 22:12 23:29 18:18
Wed, 25-Jun 02:38 03:54 04:43 13:03 21:24 22:12 23:28 18:17
Thu, 26-Jun 02:38 03:55 04:43 13:03 21:24 22:12 23:28 18:17
Fri, 27-Jun 02:39 03:55 04:44 13:04 21:23 22:12 23:27 18:16
Sat, 28-Jun 02:40 03:56 04:44 13:04 21:23 22:11 23:27 18:15
Sun, 29-Jun 02:41 03:57 04:45 13:04 21:23 22:11 23:26 18:14
Mon, 30-Jun 02:42 03:57 04:45 13:04 21:23 22:11 23:25 18:13

Notes

  • Max Height (solar noon) is when the sun is highest in the sky.
  • Day length is dawn to dusk as there is enough light for walking for at least 30 minutes before sunrise and after sunset, even on an overcast day.
  • At 'Light' (nautical dawn) the horizon becomes visible. At 'Dawn' (civil dawn) there is enough light to read, and drivers can switch their lights off. Finally the sun rises.
  • After sunset, there is still enough light to read until 'Dusk' (civil dusk) or lighting up time for drivers. The horizon is still visible until 'Dark' (nautical dusk).
  • Times will vary if there is a hill on the horizon.

Hertfordshire moonlight

Moonlight chart for walking at night.

Night of Sunset Dusk Moon Visible Dawn Sunrise Phase % Full Max. Ht. Night Walk
Thu, 02-Jan 16:02 16:42 dusk 18:55 07:27 08:07 11 % 14:28
Fri, 03-Jan 16:03 16:43 dusk 20:21 07:27 08:07 19 % 15:18
Sat, 04-Jan 16:04 16:44 dusk 21:47 07:27 08:07 28 % 16:07
Sun, 05-Jan 16:06 16:46 dusk 23:11 07:26 08:06 39 % 16:54
Mon, 06-Jan 16:07 16:47 dusk 00:36 07:26 08:06 50 % 17:41
Tue, 07-Jan 16:08 16:48 dusk 02:03 07:26 08:05 61 % 18:30
Wed, 08-Jan 16:09 16:49 dusk 03:32 07:25 08:05 72 % 19:22
Thu, 09-Jan 16:11 16:50 dusk 05:02 07:25 08:04 82 % 20:17 after dusk
Fri, 10-Jan 16:12 16:52 dusk 06:25 07:24 08:04 90 % 21:16 after dusk
Sat, 11-Jan 16:14 16:53 dusk dawn 07:24 08:03 95 % 22:18 all night
Sun, 12-Jan 16:15 16:54 dusk dawn 07:23 08:02 99 % 23:19 all night
Mon, 13-Jan 16:17 16:56 dusk dawn 07:22 08:01 100 % 00:17 all night
Tue, 14-Jan 16:18 16:57 dusk dawn 07:22 08:01 99 % 01:11 all night
Wed, 15-Jan 16:20 16:59 18:04 dawn 07:21 08:00 95 % 02:00 before dawn
Thu, 16-Jan 16:21 17:00 19:23 dawn 07:20 07:59 90 % 02:45 before dawn
Fri, 17-Jan 16:23 17:02 20:38 dawn 07:19 07:58 84 % 03:26 before dawn
Sat, 18-Jan 16:25 17:03 21:50 dawn 07:18 07:57 76 % 04:06 before dawn
Sun, 19-Jan 16:26 17:05 23:01 dawn 07:17 07:56 67 % 04:45
Mon, 20-Jan 16:28 17:06 00:12 dawn 07:16 07:54 58 % 05:25
Tue, 21-Jan 16:30 17:08 01:24 dawn 07:15 07:53 49 % 06:07
Wed, 22-Jan 16:31 17:09 02:38 dawn 07:14 07:52 39 % 06:51
Thu, 23-Jan 16:33 17:11 03:54 dawn 07:13 07:51 30 % 07:39
Fri, 24-Jan 16:35 17:12 05:08 dawn 07:12 07:50 22 % 08:31
Sat, 25-Jan 16:37 17:14 06:15 dawn 07:11 07:48 14 % 09:26
Sun, 26-Jan 16:38 17:16 07:08 dawn 07:10 07:47 8 % 10:24
Mon, 27-Jan 16:40 17:17 07:08 07:45 3 % 11:21
Tue, 28-Jan 16:42 17:19 07:07 07:44 0 %
Wed, 29-Jan 16:44 17:21 07:06 07:42 0 % 12:17
Thu, 30-Jan 16:46 17:22 dusk 18:00 07:04 07:41 3 % 13:11
Fri, 31-Jan 16:47 17:24 dusk 19:29 07:03 07:39 8 % 14:01
Sat, 01-Feb 16:49 17:26 dusk 20:56 07:02 07:38 15 % 14:50
Sun, 02-Feb 16:51 17:27 dusk 22:23 07:00 07:36 25 % 15:38
Mon, 03-Feb 16:53 17:29 dusk 23:50 06:59 07:35 35 % 16:28
Tue, 04-Feb 16:55 17:31 dusk 01:19 06:57 07:33 46 % 17:19
Wed, 05-Feb 16:57 17:33 dusk 02:49 06:55 07:31 58 % 18:13
Thu, 06-Feb 16:59 17:34 dusk 04:13 06:54 07:29 68 % 19:10
Fri, 07-Feb 17:00 17:36 dusk 05:26 06:52 07:28 78 % 20:09 after dusk
Sat, 08-Feb 17:02 17:38 dusk 06:20 06:50 07:26 86 % 21:09 after dusk
Sun, 09-Feb 17:04 17:40 dusk dawn 06:49 07:24 93 % 22:07 all night
Mon, 10-Feb 17:06 17:41 dusk dawn 06:47 07:22 97 % 23:02 all night
Tue, 11-Feb 17:08 17:43 dusk dawn 06:45 07:20 100 % 23:52 all night
Wed, 12-Feb 17:10 17:45 dusk dawn 06:44 07:18 100 % 00:38 all night
Thu, 13-Feb 17:12 17:47 18:19 dawn 06:42 07:17 98 % 01:21 before dawn
Fri, 14-Feb 17:13 17:48 19:33 dawn 06:40 07:15 94 % 02:02 before dawn
Sat, 15-Feb 17:15 17:50 20:44 dawn 06:38 07:13 89 % 02:41 before dawn
Sun, 16-Feb 17:17 17:52 21:55 dawn 06:36 07:11 83 % 03:21 before dawn
Mon, 17-Feb 17:19 17:54 23:07 dawn 06:34 07:09 75 % 04:01
Tue, 18-Feb 17:21 17:55 00:20 dawn 06:32 07:07 66 % 04:44
Wed, 19-Feb 17:23 17:57 01:35 dawn 06:30 07:05 57 % 05:30
Thu, 20-Feb 17:24 17:59 02:49 dawn 06:28 07:03 48 % 06:20
Fri, 21-Feb 17:26 18:01 03:59 dawn 06:26 07:01 38 % 07:13
Sat, 22-Feb 17:28 18:02 04:58 dawn 06:24 06:58 28 % 08:08
Sun, 23-Feb 17:30 18:04 05:43 dawn 06:22 06:56 20 % 09:05
Mon, 24-Feb 17:32 18:06 06:15 dawn 06:20 06:54 12 % 10:02
Tue, 25-Feb 17:34 18:08 06:18 06:52 6 % 10:56
Wed, 26-Feb 17:35 18:09 06:16 06:50 2 % 11:49
Thu, 27-Feb 17:37 18:11 06:14 06:48 0 %
Fri, 28-Feb 17:39 18:13 dusk 18:28 06:12 06:46 1 % 12:40
Sat, 01-Mar 17:41 18:14 dusk 19:58 06:10 06:43 6 % 13:30
Sun, 02-Mar 17:43 18:16 dusk 21:29 06:08 06:41 12 % 14:20
Mon, 03-Mar 17:44 18:18 dusk 23:01 06:05 06:39 21 % 15:12
Tue, 04-Mar 17:46 18:20 dusk 00:33 06:03 06:37 31 % 16:07
Wed, 05-Mar 17:48 18:21 dusk 02:02 06:01 06:35 42 % 17:04
Thu, 06-Mar 17:50 18:23 dusk 03:19 05:59 06:32 54 % 18:04
Fri, 07-Mar 17:51 18:25 dusk 04:19 05:57 06:30 64 % 19:04
Sat, 08-Mar 17:53 18:27 dusk 05:01 05:54 06:28 74 % 20:02
Sun, 09-Mar 17:55 18:28 dusk 05:29 05:52 06:26 83 % 20:58 after dusk
Mon, 10-Mar 17:57 18:30 dusk 05:48 05:50 06:23 90 % 21:48 after dusk
Tue, 11-Mar 17:58 18:32 dusk dawn 05:48 06:21 95 % 22:35 all night
Wed, 12-Mar 18:00 18:34 dusk dawn 05:45 06:19 98 % 23:18 all night
Thu, 13-Mar 18:02 18:35 dusk dawn 05:43 06:17 100 % 23:59 all night
Fri, 14-Mar 18:04 18:37 dusk dawn 05:41 06:14 100 % 00:39 all night
Sat, 15-Mar 18:05 18:39 19:41 dawn 05:39 06:12 97 % 01:18 before dawn
Sun, 16-Mar 18:07 18:41 20:53 dawn 05:36 06:10 93 % 01:58 before dawn
Mon, 17-Mar 18:09 18:42 22:05 dawn 05:34 06:07 88 % 02:40 before dawn
Tue, 18-Mar 18:11 18:44 23:20 dawn 05:32 06:05 81 % 03:25 before dawn
Wed, 19-Mar 18:12 18:46 00:34 dawn 05:29 06:03 73 % 04:12
Thu, 20-Mar 18:14 18:48 01:45 dawn 05:27 06:00 64 % 05:03
Fri, 21-Mar 18:16 18:49 02:48 dawn 05:25 05:58 55 % 05:57
Sat, 22-Mar 18:17 18:51 03:37 dawn 05:22 05:56 45 % 06:52
Sun, 23-Mar 18:19 18:53 04:14 dawn 05:20 05:54 35 % 07:47
Mon, 24-Mar 18:21 18:55 04:40 dawn 05:18 05:51 25 % 08:41
Tue, 25-Mar 18:22 18:56 04:59 dawn 05:15 05:49 16 % 09:34
Wed, 26-Mar 18:24 18:58 05:13 05:47 9 % 10:25
Thu, 27-Mar 18:26 19:00 05:10 05:44 3 % 11:15
Fri, 28-Mar 18:28 19:02 05:08 05:42 0 %
Sat, 29-Mar 18:29 19:03 06:06 06:40 0 % 12:06
Sun, 30-Mar 19:31 20:05 dusk 21:29 06:03 06:37 3 % 13:58
Mon, 31-Mar 19:33 20:07 dusk 23:05 06:01 06:35 9 % 14:54
Tue, 01-Apr 19:34 20:09 dusk 00:39 05:59 06:33 17 % 15:52
Wed, 02-Apr 19:36 20:10 dusk 02:05 05:56 06:31 27 % 16:53
Thu, 03-Apr 19:38 20:12 dusk 03:14 05:54 06:28 38 % 17:56
Fri, 04-Apr 19:40 20:14 dusk 04:02 05:52 06:26 49 % 18:56
Sat, 05-Apr 19:41 20:16 dusk 04:34 05:49 06:24 59 % 19:53
Sun, 06-Apr 19:43 20:18 dusk 04:55 05:47 06:22 69 % 20:46
Mon, 07-Apr 19:45 20:19 dusk 05:11 05:44 06:19 78 % 21:33 after dusk
Tue, 08-Apr 19:46 20:21 dusk 05:23 05:42 06:17 86 % 22:17 after dusk
Wed, 09-Apr 19:48 20:23 dusk 05:32 05:40 06:15 92 % 22:58 after dusk
Thu, 10-Apr 19:50 20:25 dusk dawn 05:37 06:13 96 % 23:38 all night
Fri, 11-Apr 19:51 20:27 dusk dawn 05:35 06:10 99 % 00:17 all night
Sat, 12-Apr 19:53 20:29 dusk dawn 05:33 06:08 100 % 00:57 all night
Sun, 13-Apr 19:55 20:30 20:53 dawn 05:30 06:06 99 % 01:38 before dawn
Mon, 14-Apr 19:56 20:32 22:06 dawn 05:28 06:04 97 % 02:22 before dawn
Tue, 15-Apr 19:58 20:34 23:21 dawn 05:26 06:02 92 % 03:08 before dawn
Wed, 16-Apr 20:00 20:36 00:33 dawn 05:24 06:00 87 % 03:58 before dawn
Thu, 17-Apr 20:02 20:38 01:39 dawn 05:21 05:57 79 % 04:50 before dawn
Fri, 18-Apr 20:03 20:40 02:33 dawn 05:19 05:55 71 % 05:44
Sat, 19-Apr 20:05 20:41 03:13 dawn 05:17 05:53 61 % 06:38
Sun, 20-Apr 20:07 20:43 03:41 dawn 05:14 05:51 51 % 07:31
Mon, 21-Apr 20:08 20:45 04:02 dawn 05:12 05:49 41 % 08:23
Tue, 22-Apr 20:10 20:47 04:18 dawn 05:10 05:47 30 % 09:12
Wed, 23-Apr 20:12 20:49 04:31 dawn 05:08 05:45 20 % 10:01
Thu, 24-Apr 20:13 20:51 04:43 dawn 05:05 05:43 12 % 10:51
Fri, 25-Apr 20:15 20:53 04:56 dawn 05:03 05:41 5 % 11:42
Sat, 26-Apr 20:17 20:55 05:01 05:39 1 %
Sun, 27-Apr 20:18 20:56 04:59 05:37 0 % 12:36
Mon, 28-Apr 20:20 20:58 dusk 22:03 04:57 05:35 2 % 13:33
Tue, 29-Apr 20:22 21:00 dusk 23:37 04:55 05:33 7 % 14:35
Wed, 30-Apr 20:23 21:02 dusk 00:57 04:52 05:31 14 % 15:39
Thu, 01-May 20:25 21:04 dusk 01:56 04:50 05:29 23 % 16:43
Fri, 02-May 20:27 21:06 dusk 02:34 04:48 05:27 33 % 17:44
Sat, 03-May 20:28 21:08 dusk 03:00 04:46 05:25 44 % 18:40
Sun, 04-May 20:30 21:10 dusk 03:18 04:44 05:24 54 % 19:30
Mon, 05-May 20:32 21:11 dusk 03:31 04:42 05:22 64 % 20:16
Tue, 06-May 20:33 21:13 dusk 03:41 04:40 05:20 73 % 20:58
Wed, 07-May 20:35 21:15 dusk 03:51 04:38 05:18 81 % 21:38 after dusk
Thu, 08-May 20:37 21:17 dusk 04:00 04:36 05:17 88 % 22:17 after dusk
Fri, 09-May 20:38 21:19 dusk 04:09 04:34 05:15 93 % 22:56 after dusk
Sat, 10-May 20:40 21:21 dusk 04:21 04:32 05:13 97 % 23:37 after dusk
Sun, 11-May 20:41 21:22 dusk dawn 04:31 05:12 99 % 00:20 all night
Mon, 12-May 20:43 21:24 dusk dawn 04:29 05:10 100 % 01:06 all night
Tue, 13-May 20:44 21:26 22:23 dawn 04:27 05:09 98 % 01:55 before dawn
Wed, 14-May 20:46 21:28 23:31 dawn 04:25 05:07 95 % 02:46 before dawn
Thu, 15-May 20:48 21:30 00:28 dawn 04:23 05:06 90 % 03:40 before dawn
Fri, 16-May 20:49 21:31 01:12 dawn 04:22 05:04 84 % 04:34 before dawn
Sat, 17-May 20:51 21:33 01:44 dawn 04:20 05:03 76 % 05:26 before dawn
Sun, 18-May 20:52 21:35 02:07 dawn 04:18 05:01 66 % 06:17
Mon, 19-May 20:53 21:37 02:24 dawn 04:17 05:00 56 % 07:06
Tue, 20-May 20:55 21:38 02:37 dawn 04:15 04:59 45 % 07:54
Wed, 21-May 20:56 21:40 02:49 dawn 04:14 04:58 34 % 08:41
Thu, 22-May 20:58 21:42 03:01 dawn 04:12 04:56 24 % 09:29
Fri, 23-May 20:59 21:43 03:14 dawn 04:11 04:55 14 % 10:20
Sat, 24-May 21:00 21:45 03:30 dawn 04:10 04:54 7 % 11:15
Sun, 25-May 21:02 21:46 04:08 04:53 2 %
Mon, 26-May 21:03 21:48 04:07 04:52 0 % 12:14
Tue, 27-May 21:04 21:49 dusk 22:29 04:06 04:51 1 % 13:18
Wed, 28-May 21:05 21:51 dusk 23:40 04:04 04:50 5 % 14:23
Thu, 29-May 21:07 21:52 dusk 00:29 04:03 04:49 11 % 15:28
Fri, 30-May 21:08 21:54 dusk 01:00 04:02 04:48 19 % 16:28
Sat, 31-May 21:09 21:55 dusk 01:22 04:01 04:47 28 % 17:22
Sun, 01-Jun 21:10 21:56 dusk 01:37 04:00 04:46 38 % 18:10
Mon, 02-Jun 21:11 21:58 dusk 01:48 03:59 04:46 48 % 18:55
Tue, 03-Jun 21:12 21:59 dusk 01:58 03:58 04:45 58 % 19:36
Wed, 04-Jun 21:13 22:00 dusk 02:08 03:58 04:44 67 % 20:16
Thu, 05-Jun 21:14 22:01 dusk 02:17 03:57 04:44 76 % 20:55 after dusk
Fri, 06-Jun 21:15 22:02 dusk 02:28 03:56 04:43 83 % 21:35 after dusk
Sat, 07-Jun 21:16 22:03 dusk 02:41 03:55 04:43 90 % 22:17 after dusk
Sun, 08-Jun 21:17 22:04 dusk 02:59 03:55 04:42 95 % 23:02 after dusk
Mon, 09-Jun 21:18 22:05 dusk 03:23 03:54 04:42 98 % 23:50 after dusk
Tue, 10-Jun 21:18 22:06 dusk dawn 03:54 04:42 100 % 00:41 all night
Wed, 11-Jun 21:19 22:07 22:23 dawn 03:54 04:41 99 % 01:35 before dawn
Thu, 12-Jun 21:20 22:08 23:11 dawn 03:53 04:41 97 % 02:29 before dawn
Fri, 13-Jun 21:20 22:08 23:47 dawn 03:53 04:41 93 % 03:23 before dawn
Sat, 14-Jun 21:21 22:09 00:12 dawn 03:53 04:41 87 % 04:14 before dawn
Sun, 15-Jun 21:21 22:10 00:30 dawn 03:53 04:41 79 % 05:04 before dawn
Mon, 16-Jun 21:22 22:10 00:44 dawn 03:53 04:41 70 % 05:51
Tue, 17-Jun 21:22 22:11 00:56 dawn 03:53 04:41 60 % 06:37
Wed, 18-Jun 21:23 22:11 01:08 dawn 03:53 04:41 48 % 07:23
Thu, 19-Jun 21:23 22:11 01:20 dawn 03:53 04:41 37 % 08:11
Fri, 20-Jun 21:23 22:12 01:34 dawn 03:53 04:41 26 % 09:03
Sat, 21-Jun 21:23 22:12 01:52 dawn 03:53 04:42 17 % 09:58
Sun, 22-Jun 21:23 22:12 02:17 dawn 03:53 04:42 9 % 10:59
Mon, 23-Jun 21:24 22:12 03:54 04:42 3 %
Tue, 24-Jun 21:24 22:12 03:51 dawn 03:54 04:43 1 % 12:03
Wed, 25-Jun 21:24 22:12 dusk 22:18 03:55 04:43 1 % 13:08
Thu, 26-Jun 21:24 22:12 dusk 22:57 03:55 04:44 3 % 14:11
Fri, 27-Jun 21:23 22:12 dusk 23:23 03:56 04:44 8 % 15:08
Sat, 28-Jun 21:23 22:11 dusk 23:41 03:57 04:45 15 % 16:01
Sun, 29-Jun 21:23 22:11 dusk 23:54 03:57 04:45 23 % 16:48
Mon, 30-Jun 21:23 22:11 dusk 00:05 03:58 04:46 32 % 17:31

Notes

  • The percentage of the moon which is illuminated doesn't vary much with location.
  • A full moon is not just bigger, it is much brighter. A quarter moon (1/2 disk visible) give less than 5% of the illumination of a full moon. You can walk with a quarter moon if its high in the sky (after dusk for a growing moon, before dawn for a shrinking moon).
  • Sky glow (light reflected by air or clouds) from nearby cities, and especially snow on the ground also effect light levels.
  • Times will vary a few minutes, as (i) these figures are for the centre of the county the walk is in, (ii) if there are hills on the horizon, and (iii) if you are on a hill
  • Sunlight is ~ 1,000,000 times brighter than moonlight.
  • Of course, you need a cloudless night as well!

Hertfordshire weather (Accuweather)

Now would be a good time for a cup of tea.