Daily Report for 30th March 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.6 °C (+0.2) 05:12 5.7 °C (+2.1) 12.3 °C (+7.9), 2017 0.1 °C (-4.3), 2013
Maximum Temperature 19.3 °C (+7.8) 13:46 12.4 °C (+2.1) 23.6 °C (+12.1), 2021 4.8 °C (-6.7), 2013
Mean Temperature 12.1 °C (+4.0) 9.1 °C (+2.1) 16.4 °C, 2017 2.4 °C, 2013
Minimum Humidity 44% 13:38 60% 83%, 2018 28%, 2021
Maximum Humidity 94% 07:25 89% 95%, 2010 76%, 2013
Mean Humidity 70% 77% 90%, 2018 58%, 2014
Minimum Pressure 1020 hPa 15:25 1012 hPa 1032 hPa, 2020 984 hPa, 2010
Maximum Pressure 1025 hPa 00:00 1021 hPa 1040 hPa, 2020 992 hPa, 2010
Mean Pressure 1022 hPa 1017 hPa 1035 hPa, 2020 988 hPa, 2010
Mean Wind Speed 2.1 mph (-3.1) 6.4 mph (+1.2) 7.7 mph, 2015 1.5 mph, 2021
Maximum Wind Speed 11.2 mph 22:52 16.9 mph 19.2 mph, 2015 7.4 mph, 2012
Maximum Gust 13.8 mph 22:53 27.2 mph 28.4 mph, 2015 10.2 mph, 2012
Mean Wind Direction NNW
Rainfall 0.0 mm 48.4 mm (119%) 10.8 mm, 2018
Maximum Hourly Rain n/a 3.5, 2018
Maximum 10-min Rain n/a 0.9, 2018
Maximum Rain Rate n/a 6.6, 2018
Minimum Dew Point 3.3 °C 05:09 2.8 °C 7.1 °C, 2017 -5.1 °C, 2013
Maximum Dew Point 9.0 °C 10:35 7.4 °C 10.5 °C, 2015 -2.2 °C, 2013
Mean Dew Point 6.2 °C 5.1 °C 8.2 °C, 2017 -3.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.6 °C 05:12 6.2 °C 12.3 °C, 2017 0.7 °C, 2013
Day Maximum (09-21) 19.3 °C 13:47 12.4 °C 23.6 °C, 2021 4.8 °C, 2013
Max 10m Temp Rise 0.8 °C 08:09 0.5 °C 1.2 °C, 2021 0.3 °C, 2011
Max 1hr Temp Rise 3.9 °C 08:44 1.9 °C 5.3 °C, 2021 0.9 °C, 2011
Max 1hr Hum Rise 6% 16:50 10% 17%, 2015 4%, 2009
Max 10m Temp Fall 0.4 °C 12:47 0.6 °C 1.3 °C, 2020 0.3 °C, 2015
Max 1hr Temp Fall 1.4 °C 18:30 1.7 °C 3.8 °C, 2021 0.7 °C, 2018
Max 1hr Hum Fall 18% 08:35 11% 24%, 2014 9%, 2012
Max 10m Wind Speed 7.5 mph 23:01 12.5 mph 14.0 mph, 2015 5.4 mph, 2012
Minimum Feels-like 4.6 °C 05:01 2.4 °C 12.4 °C, 2017 -4.4 °C, 2013
Maximum Feels-like 19.4 °C 13:45 12.5 °C 23.6 °C, 2021 2.8 °C, 2013
Mean Feels-like 12.2 °C 7.8 °C 16.9 °C, 2017 -1.0 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 14.7 °C (+7.6) 6.7 °C (+0.0) 19.8 °C (+12.7), 2021 2.0 °C (-5.1), 2011
Humidity Range 50% 29% 65%, 2021 12%, 2018
Pressure Range 5 hPa 9 hPa 12 hPa, 2015 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [70%]99 hrs (96%) [31%] 11.5 [100%], 2021 0 [0%], 2011
Wet Hours 065 hrs (127%) [9%] 7, 2018 , 2009
Cloud Cover am: Sunny
pm: Partly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) n/a
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