Wendover Circular via The Lee and Swan Bottom walk

Met Office Forecast

South East England

Cold with sunny spells and scattered wintry showers.

Today:

Frosty start for many areas, with ice on untreated surfaces. Any freezing fog patches, or areas of low cloud, will gradually lift and break leaving sunny spells. Then scattered wintry showers arrive this afternoon, falling as hail, sleet or snow. Maximum Temperature 5C.

Tonight:

Residual wintry showers will fade away, and most places will become clear with a sharp frost developing and perhaps some patchy freezing fog. Icy stretches will form on untreated surfaces. Minimum Temperature -5C.

Sunday:

Starting with sunny spells for eastern areas, and any freezing fog clearing. Soon areas of snow arrive across Hampshire and then erratically spread northeastwards, potentially producing significant accumulations in places. Maximum Temperature 4C.

Outlook for Monday to Wednesday:

Monday very frosty start and patchy freezing fog slowly clearing, then sunny spells. Tuesday frosty start, but cloud, rain and eventually milder conditions arriving. Wednesday mild, becoming cloudy, rain later.

Day 6-7 and Week 2:

Unsettled conditions look likely to dominate for this period, with low pressure across the UK. This should bringing changeable weather to most of the country, with periods of rain, showers, and strong winds at times. While westerly and southwesterly winds are expected to be dominant for most of the period, occasional northerly winds are possible, brining a chance of snowfall, likely confined to the far north. Milder conditions in generally may start to spread across most of the UK at points during most of this period. Towards the end of the period, we may see high pressure bringing a higher than average chance of cold weather with wintry outbreaks. However, there is a chance of drier than average conditions, which would bring increased frost and fog risks.

Week 3 and 4:

Confidence is low for this period, but current signals indicate a possible high pressure system around or near the UK during this period. This would likely bring cold northerly winds, producing colder than average temperatures and wintry outbreaks. The second half of February is likely to have a mixture of weather types, with periods of wet, windy and milder weather interspersed with drier, calmer, colder periods.

Met Office : South East England : 2021-01-23T05:10:25

Daylight : Buckinghamshire

Day length is dusk to dawn. Times will vary a little if there is a hill on the horizon.

It should still be light enough to read at dawn and dusk, so there will be enough light for walking even earlier (later).

Moonlight : Buckinghamshire

Notes

• The moon's phase or fracillum (percentage of the moon illuminated) doesn't vary much with location.
• A full moon is not just bigger, its much brighter. A half moon ('50%') give less than 5% of the illumination of a full moon. You can walk with a half 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
• Of course, you need a cloudless night as well!