Daily Report for 24th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.6 °C (-1.3) 06:25 3.6 °C (-0.5) 8.3 °C (+3.4), 2010 -1.0 °C (-5.9), 2014
Maximum Temperature 13.3 °C (+1.5) 14:15 9.7 °C (-0.9) 18.8 °C (+7.0), 2012 0.9 °C (-10.9), 2013
Mean Temperature 9.1 °C (+0.1) 6.7 °C (-0.7) 11.9 °C, 2012 -0.1 °C, 2013
Minimum Humidity 67% 13:22 66% 77%, 2018 33%, 2020
Maximum Humidity 92% 07:00 90% 98%, 2013 69%, 2009
Mean Humidity 80% 80% 88%, 2018 56%, 2009
Minimum Pressure 1021 hPa 15:19 1019 hPa 1030 hPa, 2022 996 hPa, 2023
Maximum Pressure 1023 hPa 00:06 1027 hPa 1038 hPa, 2011 1000 hPa, 2023
Mean Pressure 1022 hPa 1023 hPa 1032 hPa, 2011 999 hPa, 2023
Mean Wind Speed 5.3 mph (+0.1) 5.1 mph (-0.1) 9.0 mph, 2009 0.7 mph, 2022
Maximum Wind Speed 11.7 mph 09:45 13.8 mph 22.8 mph, 2023 7.0 mph, 2022
Maximum Gust 16.0 mph 12:41 20.6 mph 35.0 mph, 2009 10.3 mph, 2022
Mean Wind Direction WSW
Rainfall 0.0 mm 17.7 mm (59%) 10.1 mm, 2023
Maximum Hourly Rain n/a 4.1, 2023
Maximum 10-min Rain n/a 1.7, 2023
Maximum Rain Rate n/a 30, 2023
Minimum Dew Point 1.9 °C 06:14 1.1 °C 7.4 °C, 2010 -6.0 °C, 2013
Maximum Dew Point 8.0 °C 16:54 5.5 °C 10.2 °C, 2010 0.5 °C, 2013
Mean Dew Point 5.8 °C 3.3 °C 8.6 °C, 2010 -2.6 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.6 °C 06:26 4.0 °C 8.3 °C, 2010 -1.0 °C, 2014
Day Maximum (09-21) 13.3 °C 14:53 9.7 °C 18.8 °C, 2012 0.7 °C, 2013
Max 10m Temp Rise 0.6 °C 08:22 0.5 °C 1.0 °C, 2014 0.2 °C, 2013
Max 1hr Temp Rise 2.5 °C 08:38 1.5 °C 4.9 °C, 2014 0.8 °C, 2013
Max 1hr Hum Rise 6% 17:15 7% 15%, 2023 2%, 2013
Max 10m Temp Fall 0.3 °C 06:00 0.5 °C 1.4 °C, 2023 0.2 °C, 2013
Max 1hr Temp Fall 0.9 °C 20:03 1.5 °C 2.7 °C, 2024 0.4 °C, 2013
Max 1hr Hum Fall 8% 08:28 8% 21%, 2019 3%, 2016
Max 10m Wind Speed 9.2 mph 13:05 10.4 mph 17.2 mph, 2023 4.8 mph, 2022
Minimum Feels-like -0.2 °C 06:26 0.5 °C 6.2 °C, 2010 -8.5 °C, 2013
Maximum Feels-like 13.6 °C 14:22 9.7 °C 18.8 °C, 2012 -1.8 °C, 2013
Mean Feels-like 8.1 °C 5.1 °C 11.9 °C, 2010 -5.1 °C, 2013
Air-frost Hrs 0 hrs 0.1 hrs 12 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.7 °C (+2.8) 6.1 °C (-0.4) 14.3 °C (+7.4), 2022 1.7 °C (-5.2), 2013
Humidity Range 25% 24% 61%, 2022 17%, 2018
Pressure Range 3 hPa 8 hPa 11 hPa, 2011 3 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [18%]66 hrs (76%) [26%] 11.2 [101%], 2020 0 [0%], 2013
Wet Hours 023 hrs (56%) [4%] 9, 2016 , 2009
Cloud Cover am: Hazy or Partly Cloudy
pm: Overcast
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 9.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 24th March 2021.
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.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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