Daily Report for 21st March 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.7 °C (-5.4) 04:52 2.6 °C (-1.4) 9.3 °C (+4.6), 2019 -0.7 °C (-5.4), 2018
Maximum Temperature 10.3 °C (-1.1) 14:36 8.4 °C (-2.2) 16.4 °C (+5.0), 2024 6.3 °C (-5.1), 2013
Mean Temperature 5.2 °C (-3.3) 5.3 °C (-1.8) 12.0 °C, 2024 3.5 °C, 2013
Minimum Humidity 43% 16:41 67% 76%, 2023 32%, 2020
Maximum Humidity 93% 06:45 92% 97%, 2010 77%, 2012
Mean Humidity 69% 82% 86%, 2023 58%, 2017
Minimum Pressure 1026 hPa 23:44 997 hPa 1033 hPa, 2011 999 hPa, 2014
Maximum Pressure 1034 hPa 01:36 1005 hPa 1036 hPa, 2011 1008 hPa, 2014
Mean Pressure 1031 hPa 1001 hPa 1034 hPa, 2011 1005 hPa, 2014
Mean Wind Speed 4.5 mph (-0.7) 6.6 mph (+1.4) 9.0 mph, 2020 2.0 mph, 2022
Maximum Wind Speed 13.5 mph 15:08 15.8 mph 21.5 mph, 2014 7.5 mph, 2022
Maximum Gust 19.6 mph 11:10 24.4 mph 34.6 mph, 2020 10.7 mph, 2011
Mean Wind Direction WNW
Rainfall 0.0 mm 39.3 mm (149%) 2.4 mm, 2014
Maximum Hourly Rain n/a 2.4, 2014
Maximum 10-min Rain n/a 1.5, 2014
Maximum Rain Rate n/a 18, 2014
Minimum Dew Point -2.6 °C 16:41 0.0 °C 7.5 °C, 2023 -6.5 °C, 2020
Maximum Dew Point 1.9 °C 10:22 4.7 °C 11.8 °C, 2024 0.6 °C, 2013
Mean Dew Point -0.4 °C 2.4 °C 9.2 °C, 2024 -1.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.7 °C 04:52 2.9 °C 9.3 °C, 2019 -0.7 °C, 2018
Day Maximum (09-21) 10.3 °C 14:36 7.9 °C 16.4 °C, 2024 6.3 °C, 2013
Max 10m Temp Rise 0.7 °C 09:41 0.5 °C 0.8 °C, 2014 0.4 °C, 2013
Max 1hr Temp Rise 2.5 °C 07:45 1.5 °C 3.2 °C, 2022 0.9 °C, 2015
Max 1hr Hum Rise 10% 18:34 8% 17%, 2020 3%, 2019
Max 10m Temp Fall 0.6 °C 10:48 0.4 °C 0.8 °C, 2014 0.2 °C, 2013
Max 1hr Temp Fall 2.0 °C 01:19 1.3 °C 2.3 °C, 2016 0.8 °C, 2013
Max 1hr Hum Fall 12% 08:23 10% 23%, 2020 6%, 2019
Max 10m Wind Speed 9.9 mph 15:12 12.3 mph 15.8 mph, 2020 5.6 mph, 2011
Minimum Feels-like -3.6 °C 06:21 -1.9 °C 6.8 °C, 2019 -3.6 °C, 2018
Maximum Feels-like 10.3 °C 14:34 7.3 °C 18.4 °C, 2024 5.0 °C, 2013
Mean Feels-like 3.1 °C 2.5 °C 12.9 °C, 2024 0.7 °C, 2013
Air-frost Hrs 5 hrs 4 hrs 5 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.0 °C (+4.3) 5.7 °C (-0.7) 16.0 °C (+9.3), 2022 4.0 °C (-2.7), 2015
Humidity Range 50% 25% 53%, 2020 16%, 2019
Pressure Range 8 hPa 9 hPa 14 hPa, 2010 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [92%]44 hrs (58%) [20%] 10.9 [100%], 2009 0 [0%], 2015
Wet Hours 062 hrs (172%) [12%] 2, 2023 , 2009
Cloud Cover am: Sunny transitioned to Mostly Sunny
pm: Sunny
Events Air Frost
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 21st March 2018.
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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Wind rose