Daily Report for 21st July 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.6 °C (-0.2) 05:13 15.8 °C (+2.7) 16.8 °C (+3.0), 2018 10.9 °C (-2.9), 2012
Maximum Temperature 22.6 °C (-0.1) 17:17 24.6 °C (+2.3) 28.3 °C (+5.6), 2018 19.3 °C (-3.4), 2011
Mean Temperature 18.4 °C (-0.1) 20.1 °C (+2.5) 22.4 °C, 2018 14.9 °C, 2011
Minimum Humidity 45% 15:34 45% 67%, 2011 34%, 2010
Maximum Humidity 76% 23:57 78% 95%, 2009 76%, 2010
Mean Humidity 59% 61% 88%, 2011 53%, 2010
Minimum Pressure 1005 hPa 20:26 1013 hPa 1020 hPa, 2012 1003 hPa, 2009
Maximum Pressure 1011 hPa 03:53 1019 hPa 1027 hPa, 2012 1009 hPa, 2010
Mean Pressure 1008 hPa 1016 hPa 1023 hPa, 2012 1007 hPa, 2010
Mean Wind Speed 6.6 mph (+2.3) 3.7 mph (-0.6) 6.9 mph, 2015 1.5 mph, 2018
Maximum Wind Speed 16.0 mph 08:23 11.4 mph 16.0 mph, 2017 6.6 mph, 2018
Maximum Gust 24.1 mph 08:23 17.5 mph 27.6 mph, 2019 10.2 mph, 2012
Mean Wind Direction S
Rainfall 3.5 mm 49.4 mm (174%) 4.1 mm, 2011
Maximum Hourly Rain 2.0 mm 23:52 3.6 mm, 2011
Maximum 10-min Rain 0.5 mm 23:40 1.6 mm, 2011
Maximum Rain Rate 10 mm/h 23:39 30 mm/h, 2011
Minimum Dew Point 7.9 °C 00:29 9.1 °C 12.9 °C, 2018 6.8 °C, 2012
Maximum Dew Point 12.4 °C 23:35 14.6 °C 17.7 °C, 2009 12.4 °C, 2017
Mean Dew Point 9.9 °C 11.9 °C 15.5 °C, 2014 9.7 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.6 °C 05:13 15.9 °C 17.9 °C, 2010 10.9 °C, 2012
Day Maximum (09-21) 22.6 °C 17:17 24.6 °C 28.3 °C, 2018 19.3 °C, 2011
Max 10m Temp Rise 0.8 °C 11:41 0.6 °C 0.9 °C, 2012 0.4 °C, 2011
Max 1hr Temp Rise 2.4 °C 12:28 2.2 °C 3.3 °C, 2018 1.5 °C, 2011
Max 1hr Hum Rise 13% 23:11 8% 16%, 2010 6%, 2013
Max 10m Temp Fall 0.5 °C 23:05 0.5 °C 0.6 °C, 2009 0.3 °C, 2016
Max 1hr Temp Fall 1.8 °C 23:01 1.9 °C 2.3 °C, 2012 1.1 °C, 2016
Max 1hr Hum Fall 8% 12:15 10% 17%, 2012 7%, 2009
Max 10m Wind Speed 11.4 mph 08:25 8.4 mph 11.8 mph, 2015 3.4 mph, 2009
Minimum Feels-like 14.3 °C 04:58 17.4 °C 20.6 °C, 2018 12.0 °C, 2012
Maximum Feels-like 24.1 °C 16:52 27.4 °C 31.7 °C, 2018 21.8 °C, 2012
Mean Feels-like 19.6 °C 22.4 °C 26.2 °C, 2018 17.1 °C, 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 9.0 °C (+0.1) 8.9 °C (-0.3) 11.5 °C (+2.6), 2018 6.2 °C (-2.7), 2011
Humidity Range 31% 33% 51%, 2018 27%, 2011
Pressure Range 6 hPa 6 hPa 11 hPa, 2009 3 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [41%]133 hrs (105%) [43%] 12 [82%], 2010 [0%], 2019
Wet Hours 2
[Mean rain rate: 1.8 mm/h]
19 hrs (82%) [3.8%] 4, 2009 , 2019
Cloud Cover Partly Cloudy with periods of Mostly Sunny
Events None
Comments 22- Rain
Extra Comments
Issues Rn data from brixton (switched at 23 from faulty n16)
Observer Absent? Yes - observations may be unreliable
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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