Daily Report for 1st April 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.3 °C (-4.2) 00:17 0.3 °C (-4.2) 11.8 °C (+7.3), 2011 -0.9 °C (-5.4), 2020
Maximum Temperature 5.3 °C (-6.4) 15:58 5.3 °C (-6.4) 18.5 °C (+6.8), 2014 5.3 °C (-6.4), 2013
Mean Temperature 2.4 °C (-5.3) 2.4 °C (-5.3) 13.5 °C, 2014 2.4 °C, 2013
Minimum Humidity 43% 15:48 43% 68%, 2011 36%, 2012
Maximum Humidity 75% 02:54 75% 95%, 2014 75%, 2013
Mean Humidity 61% 61% 80%, 2011 56%, 2015
Minimum Pressure 1011 hPa 17:34 1011 hPa 1021 hPa, 2009 1000 hPa, 2010
Maximum Pressure 1013 hPa 00:38 1013 hPa 1030 hPa, 2020 1010 hPa, 2010
Mean Pressure 1011 hPa 1011 hPa 1025 hPa, 2020 1005 hPa, 2010
Mean Wind Speed 8.2 mph (+3.3) 8.2 mph (+3.3) 9.2 mph, 2015 1.0 mph, 2014
Maximum Wind Speed 19.7 mph 16:29 19.7 mph 19.7 mph, 2013 7.1 mph, 2014
Maximum Gust 25.5 mph 15:46 25.5 mph 28.6 mph, 2015 9.0 mph, 2012
Mean Wind Direction ENE
Rainfall 0.0 mm 0.0 mm (0%) 2.9 mm, 2018
Maximum Hourly Rain n/a 2.2, 2018
Maximum 10-min Rain n/a 1.4, 2014
Maximum Rain Rate n/a 20, 2014
Minimum Dew Point -7.2 °C 18:40 -7.2 °C 9.4 °C, 2011 -7.2 °C, 2013
Maximum Dew Point -2.2 °C 10:35 -2.2 °C 12.0 °C, 2014 -2.2 °C, 2013
Mean Dew Point -4.6 °C -4.6 °C 10.0 °C, 2011 -4.6 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.3 °C 00:17 0.3 °C 11.8 °C, 2011 -0.9 °C, 2020
Day Maximum (09-21) 5.3 °C 15:58 5.3 °C 18.5 °C, 2014 5.3 °C, 2013
Max 10m Temp Rise 0.5 °C 14:37 0.5 °C 1.0 °C, 2016 0.3 °C, 2011
Max 1hr Temp Rise 1.2 °C 14:37 1.2 °C 4.8 °C, 2016 1.0 °C, 2018
Max 1hr Hum Rise 5% 21:36 5% 23%, 2010 5%, 2011
Max 10m Temp Fall 0.4 °C 16:30 0.4 °C 1.6 °C, 2010 0.3 °C, 2014
Max 1hr Temp Fall 1.0 °C 20:02 1.0 °C 2.8 °C, 2010 1.0 °C, 2013
Max 1hr Hum Fall 17% 11:28 17% 19%, 2016 7%, 2015
Max 10m Wind Speed 13.7 mph 16:31 13.7 mph 13.7 mph, 2013 4.5 mph, 2014
Minimum Feels-like -5.9 °C 23:35 -5.9 °C 12.9 °C, 2011 -5.9 °C, 2013
Maximum Feels-like 2.1 °C 14:36 2.1 °C 18.9 °C, 2014 2.1 °C, 2013
Mean Feels-like -2.0 °C -2.0 °C 14.8 °C, 2011 -2.0 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 4 hrs, 2020 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.0 °C (-2.2) 5.0 °C (-2.1) 13.9 °C (+6.8), 2009 3.5 °C (-3.7), 2018
Humidity Range 32% 32% 48%, 2012 22%, 2011
Pressure Range 2 hPa 2 hPa 14 hPa, 2019 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.7 [32%]3.7 hrs (81%) [32%] 11.5 [99%], 2019 0 [0%], 2018
Wet Hours 00 hrs (0%) [0%] 2, 2015 0, 2009
Cloud Cover am: Overcast
pm: Mostly Cloudy transitioned to Sunny
Events None
Comments -
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 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

daycamsumLarge resolution version

Wind rose