Daily Report for 8th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.3 °C (-3.2) 03:50 1.8 °C (-0.9) 8.1 °C (+5.2), 2017 -3.1 °C (-6.0), 2010
Maximum Temperature 9.4 °C (-0.2) 16:39 6.8 °C (-2.5) 15.9 °C (+6.3), 2014 6.4 °C (-3.2), 2010
Mean Temperature 5.3 °C (-1.7) 4.3 °C (-1.7) 11.4 °C, 2014 1.7 °C, 2010
Minimum Humidity 63% 16:17 71% 98%, 2013 36%, 2014
Maximum Humidity 87% 04:54 92% 98%, 2013 78%, 2012
Mean Humidity 75% 82% 98%, 2013 62%, 2014
Minimum Pressure 1023 hPa 23:52 1028 hPa 1027 hPa, 2010 992 hPa, 2018
Maximum Pressure 1026 hPa 00:14 1032 hPa 1035 hPa, 2012 1001 hPa, 2013
Mean Pressure 1024 hPa 1030 hPa 1030 hPa, 2010 997 hPa, 2013
Mean Wind Speed 1.4 mph (-3.8) 2.0 mph (-3.2) 9.7 mph, 2020 1.4 mph, 2021
Maximum Wind Speed 8.7 mph 16:35 9.5 mph 25.7 mph, 2018 6.4 mph, 2013
Maximum Gust 12.5 mph 16:19 13.8 mph 35.7 mph, 2018 8.7 mph, 2013
Mean Wind Direction N
Rainfall 0.0 mm 6.7 mm (62%) 12.5 mm, 2013
Maximum Hourly Rain n/a 3.3, 2020
Maximum 10-min Rain n/a 2.4, 2020
Maximum Rain Rate n/a 36, 2020
Minimum Dew Point -2.6 °C 03:28 -0.6 °C 7.5 °C, 2013 -7.6 °C, 2010
Maximum Dew Point 3.6 °C 14:40 3.1 °C 10.8 °C, 2017 0.1 °C, 2010
Mean Dew Point 1.1 °C 1.4 °C 8.5 °C, 2013 -4.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.3 °C 03:48 1.8 °C 9.4 °C, 2020 -3.1 °C, 2010
Day Maximum (09-21) 9.4 °C 16:36 6.8 °C 15.9 °C, 2014 6.4 °C, 2010
Max 10m Temp Rise 0.4 °C 11:30 0.4 °C 0.9 °C, 2011 0.1 °C, 2013
Max 1hr Temp Rise 1.6 °C 12:03 1.2 °C 4.4 °C, 2011 0.3 °C, 2013
Max 1hr Hum Rise 5% 04:05 6% 21%, 2020 0%, 2013
Max 10m Temp Fall 0.3 °C 01:56 0.3 °C 1.0 °C, 2020 0.2 °C, 2010
Max 1hr Temp Fall 1.5 °C 03:28 1.2 °C 3.5 °C, 2020 0.5 °C, 2010
Max 1hr Hum Fall 5% 13:01 8% 16%, 2014 0%, 2013
Max 10m Wind Speed 6.8 mph 16:26 6.4 mph 19.4 mph, 2018 4.8 mph, 2013
Minimum Feels-like -1.4 °C 00:01 -1.1 °C 6.2 °C, 2013 -7.4 °C, 2010
Maximum Feels-like 9.2 °C 14:33 6.7 °C 15.9 °C, 2014 4.1 °C, 2010
Mean Feels-like 4.6 °C 3.0 °C 10.7 °C, 2017 -1.4 °C, 2010
Air-frost Hrs 1 hrs 0.4 hrs 9 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.7 °C (+3.1) 4.9 °C (-1.6) 14.0 °C (+7.4), 2011 1.9 °C (-4.7), 2013
Humidity Range 24% 21% 52%, 2014 0%, 2013
Pressure Range 4 hPa 5 hPa 13 hPa, 2016 4 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [10%]15 hrs (58%) [19%] 10 [98%], 2011 0 [0%], 2013
Wet Hours 05 hrs (37%) [2.6%] 17, 2013 , 2009
Cloud Cover am: Overcast
pm: Overcast transitioned to Hazy
Events Air Frost
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose