Daily Report for 5th April 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.1 °C (+3.6) 04:52 9.0 °C (+3.5) 12.2 °C (+6.7), 2024 1.3 °C (-4.2), 2013
Maximum Temperature 12.6 °C (-0.8) 18:14 15.1 °C (+1.9) 21.7 °C (+8.3), 2020 7.4 °C (-6.0), 2013
Mean Temperature 10.9 °C (+1.4) 12.2 °C (+2.7) 14.7 °C, 2020 3.8 °C, 2013
Minimum Humidity 74% 00:00 57% 74%, 2011 25%, 2020
Maximum Humidity 91% 23:59 86% 94%, 2024 78%, 2009
Mean Humidity 84% 73% 84%, 2011 53%, 2020
Minimum Pressure 1020 hPa 08:53 1015 hPa 1029 hPa, 2017 1000 hPa, 2019
Maximum Pressure 1024 hPa 22:16 1020 hPa 1032 hPa, 2017 1006 hPa, 2019
Mean Pressure 1022 hPa 1017 hPa 1030 hPa, 2017 1003 hPa, 2019
Mean Wind Speed 8.5 mph (+3.6) 7.0 mph (+2.1) 9.6 mph, 2024 1.9 mph, 2015
Maximum Wind Speed 16.3 mph 15.8 mph 20.0 mph, 2024 8.1 mph, 2015
Maximum Gust 25.5 mph 10:28 23.3 mph 36.9 mph, 2024 9.7 mph, 2015
Mean Wind Direction SW
Rainfall 1.4 mm 1.4 mm (20%) 1.8 mm, 2024
Maximum Hourly Rain 0.5 mm 04:11 1.2 mm, 2024
Maximum 10-min Rain n/a 07:53 0.5, 2024
Maximum Rain Rate n/a 09:43 1.8, 2024
Minimum Dew Point 5.2 °C 00:03 4.5 °C 10.3 °C, 2024 -11.0 °C, 2021
Maximum Dew Point 10.5 °C 23:54 9.3 °C 11.9 °C, 2024 -1.1 °C, 2013
Mean Dew Point 8.3 °C 7.2 °C 11.1 °C, 2024 -3.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.1 °C 04:50 9.3 °C 12.2 °C, 2024 1.3 °C, 2013
Day Maximum (09-21) 12.6 °C 18:15 15.1 °C 21.7 °C, 2020 6.7 °C, 2021
Max 10m Temp Rise 0.2 °C 10:50 0.4 °C 0.9 °C, 2014 0.2 °C, 2011
Max 1hr Temp Rise 0.9 °C 11:23 1.7 °C 3.1 °C, 2014 0.8 °C, 2012
Max 1hr Hum Rise 5% 04:03 6% 18%, 2013 5%, 2011
Max 10m Temp Fall 0.3 °C 04:03 0.6 °C 0.7 °C, 2021 0.3 °C, 2010
Max 1hr Temp Fall 1.3 °C 04:03 1.7 °C 1.9 °C, 2021 0.7 °C, 2024
Max 1hr Hum Fall 11% 06:50 12% 18%, 2018 7%, 2012
Max 10m Wind Speed 11.0 mph 08:51 10.8 mph 16.8 mph, 2024 5.3 mph, 2015
Minimum Feels-like 5.5 °C 05:38 7.7 °C 14.0 °C, 2024 -4.6 °C, 2013
Maximum Feels-like 13.9 °C 18:03 16.1 °C 21.7 °C, 2020 4.9 °C, 2013
Mean Feels-like 10.5 °C 12.4 °C 16.0 °C, 2024 -0.4 °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 3.5 °C (-4.4) 6.1 °C (-1.6) 15.1 °C (+7.2), 2020 3.5 °C (-4.4), 2011
Humidity Range 17% 29% 55%, 2020 17%, 2011
Pressure Range 4 hPa 5 hPa 19 hPa, 2018 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]12 hrs (48%) [20%] 12 [101%], 2020 0 [0%], 2011
Wet Hours 3
[Mean rain rate: 0.5 mm/h]		3 hrs (39%) [2.5%] 3, 2011 0, 2009
Cloud Cover Overcast
Events None
Comments 03-04 Light, 0730-10 Slight-Light Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 5th April 2011.
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 derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
View monthly summary

Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose