Daily Report for 21st July 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.3 °C (+0.5) 04:14 13.8 °C (+0.7) 16.8 °C (+3.0), 2018 9.7 °C (-4.1), 2020
Maximum Temperature 21.2 °C (-1.5) 14:50 22.0 °C (-0.3) 28.3 °C (+5.6), 2018 19.3 °C (-3.4), 2011
Mean Temperature 16.8 °C (-0.5) 17.3 °C (+0.2) 22.4 °C, 2018 14.9 °C, 2011
Minimum Humidity 65% 15:55 53% 67%, 2011 34%, 2010
Maximum Humidity 95% 10:21 90% 95%, 2009 76%, 2010
Mean Humidity 83% 74% 88%, 2011 53%, 2010
Minimum Pressure 1003 hPa 22:53 1009 hPa 1026 hPa, 2020 1003 hPa, 2009
Maximum Pressure 1014 hPa 00:45 1014 hPa 1028 hPa, 2020 1009 hPa, 2010
Mean Pressure 1008 hPa 1012 hPa 1027 hPa, 2020 1007 hPa, 2010
Mean Wind Speed n/a (-4.3) 0.0 mph (-4.3) 6.9, 2015 1.5, 2018
Maximum Wind Speed n/a 0.0 mph 16, 2017 6.6, 2018
Maximum Gust n/a 0.0 mph 24.1, 2017 10.2, 2012
Mean Wind Direction n/a
Rainfall 2.5 mm 39.9 mm (140%) 4.1 mm, 2011
Maximum Hourly Rain 1.4 mm 06:51 3.6 mm, 2011
Maximum 10-min Rain 0.5 mm 06:32 1.6 mm, 2011
Maximum Rain Rate 3.3 mm/h 06:32 30 mm/h, 2011
Minimum Dew Point 10.1 °C 00:23 9.5 °C 12.9 °C, 2018 6.7 °C, 2020
Maximum Dew Point 17.7 °C 11:46 14.8 °C 17.7 °C, 2009 9.7 °C, 2020
Mean Dew Point 13.8 °C 12.2 °C 15.5 °C, 2014 8.2 °C, 2020
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.3 °C 13.8 °C 17.9 °C, 2010 9.7 °C, 2020
Day Maximum (09-21) 21.2 °C 22.0 °C 28.3 °C, 2018 19.3 °C, 2011
Max 10m Temp Rise 0.5 °C 02:54 0.7 °C 0.9 °C, 2012 0.4 °C, 2011
Max 1hr Temp Rise 1.9 °C 11:52 1.7 °C 3.3 °C, 2018 1.5 °C, 2011
Max 1hr Hum Rise 11% 03:54 8% 16%, 2010 6%, 2013
Max 10m Temp Fall 0.6 °C 03:04 0.6 °C 0.6 °C, 2009 0.3 °C, 2016
Max 1hr Temp Fall 1.5 °C 16:19 1.4 °C 2.4 °C, 2020 1.1 °C, 2016
Max 1hr Hum Fall 7% 12:30 8% 17%, 2012 7%, 2009
Max 10m Wind Speed 3.4 mph 1.4 mph 11.8 mph, 2015 3.4 mph, 2009
Minimum Feels-like n/a 0.0 °C 20.6, 2018 8.6, 2020
Maximum Feels-like n/a 0.0 °C 31.7, 2018 21.8, 2012
Mean Feels-like n/a 0.0 °C 26.2, 2018 17.1, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.9 °C (-2.0) 8.2 °C (-1.0) 12.9 °C (+4.0), 2020 6.2 °C (-2.7), 2011
Humidity Range 30% 37% 51%, 2018 27%, 2011
Pressure Range 11 hPa 5 hPa 11 hPa, 2009 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.4 [3%]110 hrs (87%) [35%] 12 [82%], 2010 0.2 [1%], 2011
Wet Hours 4
[Mean rain rate: 0.6 mm/h]
32 hrs (138%) [6.3%] 4, 2009 0, 2010
Cloud Cover not available
Events None
Comments 06-07 Moderate Rain, am Light / pm SLight Showers
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.
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Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


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Wind rose