Daily Report for 21st December 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.9 °C (-5.9) 09:04 2.0 °C (-1.3) 9.8 °C (+6.8), 2017 -2.9 °C (-5.9), 2009
Maximum Temperature 1.6 °C (-5.9) 14:23 6.4 °C (-1.7) 12.9 °C (+5.4), 2015 1.4 °C (-6.1), 2010
Mean Temperature -0.5 °C (-5.9) 4.3 °C (-1.5) 11.1 °C, 2018 -0.5 °C, 2009
Minimum Humidity 85% 02:59 81% 93%, 2010 72%, 2018
Maximum Humidity 98% 21:00 97% 98%, 2009 83%, 2016
Mean Humidity 93% 90% 96%, 2010 79%, 2016
Minimum Pressure 984 hPa 20:59 1006 hPa 1035 hPa, 2017 972 hPa, 2019
Maximum Pressure 997 hPa 01:49 1014 hPa 1036 hPa, 2017 986 hPa, 2019
Mean Pressure 990 hPa 1010 hPa 1035 hPa, 2017 980 hPa, 2019
Mean Wind Speed 2.0 mph (-3.1) 4.6 mph (-0.5) 11.9 mph, 2013 2.0 mph, 2009
Maximum Wind Speed 8.1 mph 11.0 mph 23.3 mph, 2018 8.1 mph, 2009
Maximum Gust 10.2 mph 00:47 16.4 mph 39.2 mph, 2018 10.2 mph, 2009
Mean Wind Direction SE
Rainfall / Snow-melt approx. 6.0 mm 50.0 mm (132%) 9.5 mm, 2018
Maximum Hourly Rain n/a 14:57 4.4, 2018
Maximum 10-min Rain n/a 20:41 1.2, 2013
Maximum Rain Rate n/a 14:57 54, 2013
Minimum Dew Point -4.4 °C 06:34 0.3 °C 8.3 °C, 2017 -4.4 °C, 2009
Maximum Dew Point 1.2 °C 14:18 5.6 °C 11.4 °C, 2018 0.8 °C, 2010
Mean Dew Point -1.5 °C 2.9 °C 9.6 °C, 2017 -1.5 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -2.9 °C 2.8 °C 10.1 °C, 2017 -2.9 °C, 2009
Day Maximum (09-21) 1.6 °C 6.2 °C 12.9 °C, 2015 1.4 °C, 2010
Max 10m Temp Rise 1.3 °C 12:08 0.4 °C 1.3 °C, 2009 0.1 °C, 2010
Max 1hr Temp Rise 1.9 °C 12:54 1.0 °C 1.9 °C, 2009 0.4 °C, 2017
Max 1hr Hum Rise 5% 15:42 4% 10%, 2013 2%, 2010
Max 10m Temp Fall 1.3 °C 14:42 0.4 °C 1.3 °C, 2009 0.1 °C, 2010
Max 1hr Temp Fall 1.2 °C 14:42 0.9 °C 1.7 °C, 2013 0.3 °C, 2010
Max 1hr Hum Fall 6% 14:42 6% 12%, 2013 2%, 2010
Max 10m Wind Speed 5.4 mph 00:52 7.8 mph 18.8 mph, 2018 5.4 mph, 2009
Minimum Feels-like -5.7 °C 06:12 -1.3 °C 7.3 °C, 2017 -5.7 °C, 2009
Maximum Feels-like 1.6 °C 13:56 6.9 °C 14.8 °C, 2015 1.4 °C, 2010
Mean Feels-like -0.9 °C 3.1 °C 11.7 °C, 2017 -1.2 °C, 2010
Air-frost Hrs 13 hrs 3 hrs 13 hrs, 2009 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.5 °C (+0.0) 4.4 °C (-0.4) 7.0 °C (+2.5), 2014 1.1 °C (-3.4), 2010
Humidity Range 13% 16% 23%, 2018 4%, 2010
Pressure Range 13 hPa 8 hPa 13 hPa, 2019 1 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]59 hrs (182%) [40%] 2.5 [36%], 2012 0 [0%], 2009
Wet Hours 6
[Mean rain rate: 1.0 mm/h]
59 hrs (139%) [12%] 12, 2013 0, 2012
Cloud Cover not available
Events Snowfall: ~6 cm
Lying Snow (at 09z): ~2 cm
Air Frost
Comments LS: 2cm; 11-15 SLight-Moderate Rain; 15-17 Heavy Lying Snow
Extra Comments 2cm Lying Snow remains 11-1130 SLight Snow, 1230-15 SLight/Light Rain , Moderate Sleet, 15-17 Heavy Lying Snow to 6cm
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs, Wet hrs, Cloud cover and Events are based on manual equipment/observations (entered with a delay of 1-10 days); their reliablity is questionable and they are provided for interest only.
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Daily Graph of Conditions

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Wind rose