Daily Report for 14th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.9 °C (+1.4) 00:01 3.1 °C (+0.1) 8.0 °C (+4.5), 2017 -1.7 °C (-5.2), 2013
Maximum Temperature 10.3 °C (+0.2) 12:08 8.6 °C (-1.0) 15.8 °C (+5.7), 2014 6.1 °C (-4.0), 2013
Mean Temperature 7.8 °C (+0.8) 5.8 °C (-0.4) 11.5 °C, 2017 2.7 °C, 2013
Minimum Humidity 62% 12:24 66% 71%, 2020 30%, 2016
Maximum Humidity 85% 01:45 90% 95%, 2009 78%, 2015
Mean Humidity 77% 80% 82%, 2020 63%, 2016
Minimum Pressure 1006 hPa 00:00 1015 hPa 1031 hPa, 2017 992 hPa, 2018
Maximum Pressure 1017 hPa 12:45 1024 hPa 1034 hPa, 2012 1011 hPa, 2018
Mean Pressure 1014 hPa 1020 hPa 1032 hPa, 2017 1003 hPa, 2018
Mean Wind Speed 8.9 mph (+3.7) 5.7 mph (+0.5) 9.6 mph, 2019 3.0 mph, 2012
Maximum Wind Speed 16.9 mph 10:01 14.1 mph 22.1 mph, 2019 6.9 mph, 2012
Maximum Gust 26.2 mph 15:40 20.8 mph 40.3 mph, 2019 9.2 mph, 2012
Mean Wind Direction WNW
Rainfall 0.0 mm 15.0 mm (79%) 4.0 mm, 2019
Maximum Hourly Rain n/a 1.7, 2020
Maximum 10-min Rain n/a 0.5, 2020
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point 1.9 °C 00:01 0.3 °C 5.2 °C, 2017 -6.7 °C, 2016
Maximum Dew Point 6.3 °C 22:43 4.6 °C 9.3 °C, 2017 -0.2 °C, 2013
Mean Dew Point 4.0 °C 2.4 °C 7.5 °C, 2017 -3.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.3 °C * 22:17 3.4 °C 8.0 °C, 2017 -1.7 °C, 2013
Day Maximum (09-21) 10.3 °C 11:50 8.5 °C 15.8 °C, 2014 6.1 °C, 2013
Max 10m Temp Rise 0.5 °C 08:09 0.4 °C 0.8 °C, 2014 0.4 °C, 2010
Max 1hr Temp Rise 1.7 °C 08:14 1.2 °C 3.8 °C, 2014 1.3 °C, 2012
Max 1hr Hum Rise 8% 15:39 7% 13%, 2015 4%, 2013
Max 10m Temp Fall 0.3 °C 15:46 0.4 °C 0.7 °C, 2012 0.2 °C, 2017
Max 1hr Temp Fall 0.8 °C 19:11 1.3 °C 2.0 °C, 2012 0.7 °C, 2013
Max 1hr Hum Fall 9% 11:12 8% 22%, 2015 5%, 2012
Max 10m Wind Speed 14.5 mph 10:13 10.6 mph 16.5 mph, 2019 5.1 mph, 2012
Minimum Feels-like -0.4 °C 00:25 -0.5 °C 5.4 °C, 2017 -6.1 °C, 2013
Maximum Feels-like 10.3 °C 11:15 8.4 °C 15.9 °C, 2017 6.0 °C, 2013
Mean Feels-like 4.6 °C 3.9 °C 11.4 °C, 2017 0.6 °C, 2013
Air-frost Hrs 0 hrs 0.2 hrs 8 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.4 °C (-1.3) 5.5 °C (-1.1) 13.2 °C (+6.5), 2014 5.4 °C (-1.3), 2021
Humidity Range 23% 24% 57%, 2016 18%, 2017
Pressure Range 12 hPa 9 hPa 19 hPa, 2018 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [19%]36 hrs (78%) [25%] 9.5 [90%], 2014 0.3 [3%], 2017
Wet Hours 019 hrs (77%) [5.5%] 6, 2019 , 2009
Cloud Cover am: Partly Cloudy
pm: Overcast
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.5 °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 are initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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Webcam Summary of Cloud Conditions

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