On Friday, 15 January 2016 22:20:32 UTC, Dave Cornwell wrote:
I don't really know what is going on these days but in a so called cold
snap in January following a cloudless day and a crystal clear evening
the temperature is stuck at +2.2C at 10.20 pm. I was expecting much
lower temperatures at this stage.
Dave

Similar here but the temperature is now (0050) falling slowly and is +0..4°C with a brilliant starry sky and the wind decreased to F2. The grass, in the darkness, felt slightly crunchy and I think there'll be an air frost though not much of one. Last night the temp was a steady 0°C (min 0.0°C). The air is dry enough - it's the wind and maybe heat from the ground.

Tudor Hughes, Warlingham, NE Surrey, 557 ft, 169 m.