Hampstead Heath walk

Met Office Forecast

South East England

Cold and frosty but bright.

Today:

Dry, with sunny spells for most, but feeling cold with a frosty start. Plenty of sunny spells through the morning and afternoon as winds become increasingly light. Maximum Temperature 7C.

Tonight:

Becoming cloudy from the west this evening with outbreaks of showery rain along the south coast toward midnight. Becoming dry later with a risk of fog. Feeling cold. Minimum Temperature -2C.

Saturday:

Another rather cold and frosty start for many on Saturday. Becoming bright and sunny by day but with a cold and frosty night to follow. Maximum Temperature 5C.

Outlook for Sunday to Tuesday:

Feeling cold but remaining largely dry with light winds and sunny spells on Sunday and Monday. Sharp overnight frosts are likely. Turning wet and windy from the west on Tuesday.

Day 6-7 and Week 2:

The start of the period remains unsettled with strong winds and frequent outbreaks of rain across much of the country, particularly in the north and west. This will likely fall as snow over high ground and may also at times fall to lower levels too, especially over northern and eastern areas. Further into this period unsettled conditions look most likely with low pressure dominant across the UK, bringing changeable weather with periods of rain, showers, and strong winds. Northerly winds are expected at times, increasing the risk of snowfall especially in the north. In the south, milder interludes may occur bringing at or above average temperatures. Overall temperatures are likely to be rather cold in the north but close to average in the south.

Week 3 and 4:

Confidence for this period is low, though low pressure is likely to be dominant at first with an increased chance of northerly winds. This will therefore increase the risk of snowfall especially in the north along with colder than average temperatures, potentially bringing wintry hazards more widely. Through mid-February higher pressure may develop for a time which would bring drier conditions with an increased likelihood of fog and cold, frosty nights.

Met Office : South East England : 2021-01-22T01:31:59

Daylight : London

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 : London

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!