Daily Report for 18th December 2009

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.0 °C (-5.1) 23:59 2.9 °C (-0.5) 12.4 °C (+9.3), 2014 -6.0 °C (-9.1), 2010
Maximum Temperature 0.6 °C (-7.0) 07:12 7.3 °C (-0.9) 13.7 °C (+6.1), 2015 0.3 °C (-7.3), 2010
Mean Temperature -0.2 °C (-6.1) 5.2 °C (-0.7) 13.0 °C, 2014 -2.5 °C, 2010
Minimum Humidity 86% 14:06 81% 87%, 2010 73%, 2018
Maximum Humidity 97% 06:00 97% 98%, 2010 82%, 2016
Mean Humidity 92% 91% 93%, 2010 81%, 2016
Minimum Pressure 1009 hPa 00:38 1008 hPa 1032 hPa, 2016 988 hPa, 2013
Maximum Pressure 1015 hPa 19:14 1016 hPa 1040 hPa, 2016 995 hPa, 2010
Mean Pressure 1012 hPa 1012 hPa 1036 hPa, 2016 992 hPa, 2010
Mean Wind Speed 7.5 mph (+2.4) 4.7 mph (-0.4) 9.8 mph, 2014 0.8 mph, 2016
Maximum Wind Speed 19.9 mph 11.1 mph 21.5 mph, 2014 4.7 mph, 2016
Maximum Gust 32.7 mph 00:43 16.8 mph 34.4 mph, 2013 6.3 mph, 2016
Mean Wind Direction N
Rainfall / Snow-melt approx. 3.0 mm 42.0 mm (129%) 8.0 mm, 2010
Maximum Hourly Rain 3.0 mm 14:04 4.2 mm, 2013
Maximum 10-min Rain n/a 14:04 1.3, 2013
Maximum Rain Rate n/a 9, 2013
Minimum Dew Point -3.9 °C 23:59 1.2 °C 10.4 °C, 2014 -7.8 °C, 2010
Maximum Dew Point -0.4 °C 03:31 6.5 °C 11.5 °C, 2014 -0.4 °C, 2009
Mean Dew Point -1.4 °C 3.8 °C 10.9 °C, 2014 -3.5 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * -1.3 °C * 3.8 °C 12.1 °C, 2014 -6.0 °C, 2010
Day Maximum (09-21) 0.6 °C 7.1 °C 13.7 °C, 2015 0.3 °C, 2010
Max 10m Temp Rise 0.2 °C 11:06 0.4 °C 0.7 °C, 2019 0.2 °C, 2009
Max 1hr Temp Rise 0.7 °C 13:26 0.9 °C 2.8 °C, 2019 0.5 °C, 2014
Max 1hr Hum Rise 5% 02:13 5% 10%, 2018 2%, 2016
Max 10m Temp Fall 0.2 °C 23:22 0.4 °C 0.5 °C, 2017 0.1 °C, 2014
Max 1hr Temp Fall 0.9 °C 23:22 0.9 °C 2.0 °C, 2017 0.3 °C, 2014
Max 1hr Hum Fall 3% 07:30 6% 7%, 2013 1%, 2016
Max 10m Wind Speed 16.0 mph 00:07 8.4 mph 16.2 mph, 2013 3.2 mph, 2016
Minimum Feels-like -7.8 °C 23:52 -0.3 °C 14.1 °C, 2014 -8.9 °C, 2010
Maximum Feels-like 0.6 °C 13:26 7.9 °C 15.5 °C, 2014 0.3 °C, 2010
Mean Feels-like -4.4 °C 4.1 °C 14.7 °C, 2014 -4.4 °C, 2009
Air-frost Hrs 13 hrs 1 hrs 21 hrs, 2010 0 hrs, 2012
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.6 °C (-1.9) 4.5 °C (-0.4) 8.7 °C (+4.2), 2019 1.2 °C (-3.3), 2014
Humidity Range 11% 16% 20%, 2018 3%, 2016
Pressure Range 6 hPa 8 hPa 27 hPa, 2013 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [57%]46 hrs (163%) [36%] 7 [100%], 2017 0 [0%], 2010
Wet Hours 4
[Mean rain rate: 0.8 mm/h]
51 hrs (140%) [12%] 5, 2018 0, 2011
Cloud Cover not available
Events Snowfall: ~3 cm
Lying Snow (at 09z): ~5 cm
Air Frost
Comments 00-06 Light/Moderate Lying Snow/Snow Showers: 5cm
Extra Comments
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.
View monthly summary

Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose