Ian wrote:

I've always thought it a bit daft when recording 09-09 that particularly
In winter your 09 obs of for example -2C is quite often your min for the
next 09-09 period if there is a change to a milder airmass.
2 air frost days for the price of 1.


The same can happen with 00-24. On Friday night for example the temp
dropped below zero here before midnight before much milder air moved in
around 00:30. 2 air frosts when the temp was only sub zero for a couple of
hours.


--
Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather
Live obs @ 09:11:00 : 5.9C, DP 5.9C, RH 100%, 0.2 mm