14th February lives up to it’s reputation

Figure 1

The 13/14th of February is statistically the coldest night in Central England, with a 40% chance of an air frost occurring (fig 2), and last night it lived up to its statistical reputation (fig 1), with a widespread sharp frost across a large part of the country. That should push the frequency up for that day by maybe 1/140 of a percent in the last 140 year, or does it?

Figure 2

I also noticed a jump of +6.3° in the air temperature at Exeter between 03 and 04 UTC this morning as the cloud rolled in (fig 3), temperatures are on a bit of a roller coaster ride at the moment.

Figure 3