Hampstead Heath walk

Met Office Forecast

South East England

Fine and frosty with some fog.

Today:

Fine and frosty, with areas of freezing fog in places that may prove slow to clear in the light wind. Sunny periods should develop widely as the day progresses, but it will remain on the cold side. Maximum Temperature 8C.

Tonight:

Dry during the evening and overnight, with clear spells allowing fog patches to re-form, with a frost also possible in places. Winds remaining light. Minimum Temperature -3C.

Wednesday:

A cloudier day, with mist and low cloud perhaps producing the odd spot of rain at times. Remaining rather cold, although temperatures should gradually pick up as the day progresses. Maximum Temperature 10C.

Outlook for Thursday to Saturday:

Temperatures continuing to improve to end the working week, however remaining rather murky with some mist at times. Becoming clearer but windier with some rain on Saturday.

Day 6-7 and Week 2:

Into the weekend, it will be staying cloudy for most. A spell of rain is likely for a time in the northwest, spreading southeast across most parts, accompanied by strengthening winds. Next week, it looks like the south will see the driest weather, 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 of any 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 south 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 south. 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 : 2020-01-21T01:06:47

Daylight : London

Data: US Navy Observatory

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