Harrow on the Hill walk

Met Office Forecast

South East England

Dry with clear skies and a fairly widespread frost overnight.

This Evening and Tonight:

After a fine end to the day, it will quickly turn chilly this evening. Overnight will stay dry with clear skies, and with generally light winds another chilly night with a fairly widespread ground frost, especially in rural areas. Minimum Temperature -2C.

Friday:

Another fine, dry day with plenty of sunshine and generally light winds. Feeling warm with afternoon temperatures a little higher than on Thursday. Breezier along the south coast. Maximum Temperature 18C.

Outlook for Saturday to Monday:

Occasionally cloudier, especially near the coast, but still with sunny spells and predominantly dry. Cooler by day, with a more noticeable easterly breeze developing, and still chilly overnight.

Day 6-7 and Week 2:

A settled regime will likely be in place across much of the country at first with high pressure likely to be centred to the west or northwest of the UK. However, there is the threat of some rain and a few showers in the north and east, as well as the chance of some rain moving up from the south and affecting southern parts of the country later. Throughout this period, there is also a continued threat of rural frost and patchy fog where winds fall light. Temperatures are quite uncertain depending on where the area of high pressure resides, particularly in the east where temperatures are likely to struggle above average. Warmer days are most likely to be further inland towards the south and west.

Week 3 and 4:

Confidence is low for this period as is typical of spring. The UK will likely see spells of fine, dry weather at times with fair-weather cloud and plenty of sunny spells, as well as an increased likelihood of more unsettled periods when compared to April. All areas expected to see showers or longer spells of rain at times. Temperatures are likely to be close to the average for the time of year, with the possibility of some warmer spells.

Met Office : South East England : 2021-04-22T12:20:50

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!