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Where do you get your data, out of interest?
I live near Hampstead and have quite an interest in the weather.
I've found these figures for the coldest night of the winter (20th December):
-6 (EGLC, aka London City AP; source: History : Weather Underground)
-6.1 (Hampstead; source: http://www.climate-uk.com/monthly/1012.htm)
Admittedly it was -9 at Heathrow and -14 at that notorious frost hollow, Northolt, but these are quite a way from the centre to be fair.
I tend to think of Hampstead itself as being rather urban really (maybe not technically part of the heat island though; I'm not sure on that), so I wouldn't expect the temp to decay much away from London City. Beyond that the suburbs kick in so the temp decays quite nicely on clear, calm nights, as evidenced by the above data, albeit it in a perhaps unusually strong manner.
That -5.8 was the lowest hourly figure so your -6.1 is probably right. I get my hourly data from Weather reports from Hampstead WMO (99139) and the historic (erratically presented) data from http://www.weather-uk.com/hampstead/data.htm . There's an unofficial site at NW3 Weather - Temperature Detail with much more comprehensive data, but as it's lower down and not on the Heath (as I believe the official station to be) it often gives slightly higher readings except on clear winter nights (20/12 there got down to -7.2C).
That http://www.climate-uk.com/monthly/1012.htm site looks good, I'll have a better look at that when I have the time. I thought December was dull here last time, but 8 hours for the whole of December 1956 :O
We had a range of 27.5°C early last April. The ground is still very cold but we got a warm air mass and the sun is strong and the air was dry. High 32.9°C, Low 4.9°C. We had a number of days with a range close to 20°C that month.
That's pretty crazy, though isn't that a 28C range? There's a place not far from here in a frost hollow which once recorded a 27.8C range from 1.3C to 29.1C back in the 1930s, which remains the English record, possibly never to be broken as the area is now more urbanised and is no longer an official site. This thread gives some info about the tame highest diurnal ranges we can get compared to the US:
Viewing a thread - The large diurnal temperature range at Rickmansworth for 29th August 1936 (http://www.ukweatherworld.co.uk/forum/forums/thread-view.asp?tid=29240&start=1 - broken link)
That -5.8 was the lowest hourly figure so your -6.1 is probably right. I get my hourly data from Weather reports from Hampstead WMO (99139) and the historic (erratically presented) data from http://www.weather-uk.com/hampstead/data.htm . There's an unofficial site at NW3 Weather - Temperature Detail with much more comprehensive data, but as it's lower down and not on the Heath (as I believe the official station to be) it often gives slightly higher readings except on clear winter nights (20/12 there got down to -7.2C).
That http://www.climate-uk.com/monthly/1012.htm site looks good, I'll have a better look at that when I have the time. I thought December was dull here last time, but 8 hours for the whole of December 1956 :O
Ah, that makes sense.
The climate/weather-uk site is very good indeed, it's just a shame that it is not regularly updated. It's particularly bad at the moment, with the Hampstead report for January yet to be published.
At 3:00 PM it was 43 degrees here in SE PA. It's been very overcast and windy all day and a damp biting NE wind. If it were a little bit colder I'd say it felt like it was going to snow but we're supposed to get a lot of rain tomorrow. Oh, well, we need it.
What a difference a day makes. Sunshine and warmer temps today, but windy.
Littleton, CO: 53.6 °F / 12.0 °C
Partly Cloudy
Humidity: 12%
Dew Point: 2 °F / -17 °C
Wind: 7.0 mph / 11 km/hfrom the NW
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