Daily Report for 30th March 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.7 °C (+4.4) 21:43 3.2 °C (-1.1) 12.3 °C (+7.1), 2017 0.1 °C (-5.2), 2013
Maximum Temperature 11.7 °C (-0.9) 12:13 11.2 °C (+0.1) 23.6 °C (+11.0), 2021 4.8 °C (-7.8), 2013
Mean Temperature 10.5 °C (+1.8) 7.3 °C (-0.5) 16.4 °C, 2017 2.4 °C, 2013
Minimum Humidity 74% 10:30 58% 83%, 2018 28%, 2021
Maximum Humidity 91% 23:59 88% 96%, 2024 76%, 2013
Mean Humidity 82% 74% 90%, 2018 58%, 2014
Minimum Pressure 1010 hPa 12:02 1020 hPa 1032 hPa, 2020 984 hPa, 2010
Maximum Pressure 1012 hPa 00:16 1025 hPa 1040 hPa, 2020 992 hPa, 2010
Mean Pressure 1011 hPa 1023 hPa 1035 hPa, 2020 988 hPa, 2010
Mean Wind Speed 5.8 mph (+0.6) 4.6 mph (-0.6) 9.9 mph, 2023 1.4 mph, 2009
Maximum Wind Speed 14.7 mph 11.8 mph 20.4 mph, 2023 7.4 mph, 2012
Maximum Gust 19.9 mph 15:33 16.5 mph 31.1 mph, 2023 10.0 mph, 2009
Mean Wind Direction SSW
Rainfall 2.2 mm 8.1 mm (21%) 10.8 mm, 2018
Maximum Hourly Rain 1.4 mm 13:24 3.5 mm, 2018
Maximum 10-min Rain 0.5 mm 13:07 0.9 mm, 2018
Maximum Rain Rate 2.4 mm/h 13:07 7 mm/h, 2018
Minimum Dew Point 6.1 °C 00:08 -0.0 °C 8.3 °C, 2023 -5.1 °C, 2013
Maximum Dew Point 8.8 °C 15:00 5.4 °C 11.7 °C, 2023 -2.2 °C, 2013
Mean Dew Point 7.6 °C 2.8 °C 9.7 °C, 2023 -3.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.1 °C * 06:10 3.8 °C 12.3 °C, 2017 0.7 °C, 2013
Day Maximum (09-21) 11.7 °C 10:55 11.1 °C 23.6 °C, 2021 4.8 °C, 2013
Max 10m Temp Rise 0.3 °C 00:49 0.5 °C 1.2 °C, 2021 0.3 °C, 2011
Max 1hr Temp Rise 0.9 °C 01:12 1.9 °C 5.3 °C, 2021 0.9 °C, 2011
Max 1hr Hum Rise 8% 13:18 6% 17%, 2015 4%, 2009
Max 10m Temp Fall 0.9 °C 02:02 0.4 °C 1.3 °C, 2020 0.3 °C, 2015
Max 1hr Temp Fall 3.3 °C 13:32 1.3 °C 3.8 °C, 2021 0.7 °C, 2018
Max 1hr Hum Fall 15% 10:24 9% 24%, 2014 7%, 2022
Max 10m Wind Speed 9.1 mph 11:10 8.0 mph 15.2 mph, 2023 5.4 mph, 2012
Minimum Feels-like 7.1 °C 21:50 0.7 °C 12.4 °C, 2017 -4.4 °C, 2013
Maximum Feels-like 11.9 °C 12:30 11.0 °C 23.6 °C, 2021 2.8 °C, 2013
Mean Feels-like 10.5 °C 6.0 °C 16.9 °C, 2017 -1.0 °C, 2013
Air-frost Hrs 0 hrs 0.4 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.0 °C (-5.3) 7.9 °C (+1.3) 19.8 °C (+12.5), 2021 2.0 °C (-5.3), 2011
Humidity Range 17% 29% 65%, 2021 12%, 2018
Pressure Range 2 hPa 5 hPa 12 hPa, 2015 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]122 hrs (112%) [38%] 11.5 [100%], 2021 0 [0%], 2011
Wet Hours 2
[Mean rain rate: 1.1 mm/h]		9.7 hrs (19%) [1.3%] 7, 2018 , 2009
Cloud Cover Overcast
Events None
Comments 1230-15 Light-Moderate Rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 30th March 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