Balcombe Circular via Ardingly Reservoir walk

Met Office Forecast

South East England

Dry, sunny, but feeling chilly today. Frosty tonight for many.

Today:

A fine day with light winds and plenty of sunshine across the region, although feeling colder than recent days and with temperatures quickly falling after sunset. Maximum Temperature 7C.

Tonight:

Dry and largely clear, with a widespread frost developing, the lowest temperatures across western areas by late tonight. Meanwhile a brisk wind will develop along the Kent coast. Minimum Temperature -4C.

Sunday:

Patchy cloud across east Kent, with a few showers, and breezy along the coast. Elsewhere dry and sunny after a frosty start, with light winds. Maximum Temperature 7C.

Outlook for Monday to Wednesday:

Monday overnight frost and freezing fog patches, locally slow to clear, otherwise bright and chilly. Tuesday cloudy but milder. Wednesday mist and patchy drizzle will clear, then cloudy and mild.

Day 6-7 and Week 2:

After a frosty start on Wednesday, most places are expected to be cloudy, but mostly dry with light winds. The odd spot of rain is possible, this becoming more persistent over the north of Scotland. Looking further into the week the south will be dry and cloudy with light winds whilst the north could be wetter and windier at times. Later on in this period, some rain may briefly spread further southeast across the UK, although the most unsettled weather is likely to remain in the north and northwest, where some hill snow is possible. Further southeast drier spells will be accompanied by the best brightness, along with the greatest risk of fog and frost. Temperatures will generally be near average, although a little below at times in the north.

Week 3 and 4:

Through the first half of February, we are likely to see a north/south split continuing; with the north being more unsettled than the south. The heaviest of the rainfall and strongest winds are likely to be seen across the northwest. The southeast is more likely to see drier, brighter conditions with light winds. There is potentially a greater risk of frost and fog patches developing towards the southeast. During colder, showery interludes, any snow will most likely be over higher ground in the north, but it could fall to lower levels at times. Temperatures will remain close to or above average through the period, though will likely fluctuate as frontal systems pass through, especially in the north.

Met Office : South East England : 2020-01-18T01:05:32

Daylight : West Sussex

Data: US Navy Observatory

Moonlight : West Sussex

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, and, (ii) if there are hills on the horizon.
• Of course, you need a cloudless night as well!
• Data: US Navy Observatory