Daily Report for 21st March 2014

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.8 °C (+2.1) 06:42 5.3 °C (+1.2) 9.3 °C (+4.6), 2019 -0.7 °C (-5.4), 2018
Maximum Temperature 12.6 °C (+1.2) 13:32 13.8 °C (+3.3) 16.7 °C (+5.3), 2025 6.3 °C (-5.1), 2013
Mean Temperature 9.2 °C (+1.6) 9.3 °C (+2.3) 12.9 °C, 2025 3.5 °C, 2013
Minimum Humidity 41% 14:13 51% 76%, 2023 32%, 2020
Maximum Humidity 87% 02:55 88% 97%, 2010 77%, 2012
Mean Humidity 66% 72% 86%, 2023 58%, 2017
Minimum Pressure 999 hPa 23:43 1014 hPa 1033 hPa, 2011 999 hPa, 2014
Maximum Pressure 1008 hPa 11:15 1022 hPa 1036 hPa, 2011 1008 hPa, 2014
Mean Pressure 1005 hPa 1018 hPa 1034 hPa, 2011 1005 hPa, 2014
Mean Wind Speed 7.7 mph (+2.5) 4.9 mph (-0.3) 9.0 mph, 2020 2.0 mph, 2022
Maximum Wind Speed 21.5 mph 23:10 13.3 mph 21.5 mph, 2014 7.5 mph, 2022
Maximum Gust 29.4 mph 23:09 18.6 mph 34.6 mph, 2020 10.7 mph, 2011
Mean Wind Direction SW
Rainfall 2.4 mm 15.9 mm (60%) 2.4 mm, 2014
Maximum Hourly Rain 2.4 mm 23:59 2.4 mm, 2014
Maximum 10-min Rain 1.5 mm 23:14 1.5 mm, 2014
Maximum Rain Rate 18 mm/h 23:10 18 mm/h, 2014
Minimum Dew Point -0.8 °C 14:48 1.5 °C 7.5 °C, 2023 -6.5 °C, 2020
Maximum Dew Point 6.4 °C 00:46 7.1 °C 11.8 °C, 2024 0.6 °C, 2013
Mean Dew Point 2.7 °C 4.1 °C 9.2 °C, 2024 -1.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.8 °C 06:42 5.4 °C 9.3 °C, 2019 -0.7 °C, 2018
Day Maximum (09-21) 12.6 °C 13:32 13.8 °C 16.7 °C, 2025 6.3 °C, 2013
Max 10m Temp Rise 0.8 °C 08:14 0.6 °C 0.8 °C, 2014 0.4 °C, 2013
Max 1hr Temp Rise 2.2 °C 08:55 2.5 °C 3.2 °C, 2022 0.9 °C, 2015
Max 1hr Hum Rise 14% 19:04 8% 17%, 2020 3%, 2019
Max 10m Temp Fall 0.8 °C 23:21 0.5 °C 0.8 °C, 2014 0.2 °C, 2013
Max 1hr Temp Fall 1.6 °C 23:46 1.5 °C 2.3 °C, 2016 0.8 °C, 2013
Max 1hr Hum Fall 17% 09:37 12% 23%, 2020 6%, 2019
Max 10m Wind Speed 14.3 mph 15:23 9.9 mph 15.8 mph, 2020 5.6 mph, 2011
Minimum Feels-like 3.4 °C 23:09 2.9 °C 6.8 °C, 2019 -3.6 °C, 2018
Maximum Feels-like 12.6 °C 13:29 13.8 °C 18.4 °C, 2024 5.0 °C, 2013
Mean Feels-like 7.7 °C 8.4 °C 12.9 °C, 2024 0.7 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 5 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.8 °C (-0.9) 8.5 °C (+2.1) 16.0 °C (+9.3), 2022 4.0 °C (-2.7), 2015
Humidity Range 46% 38% 53%, 2020 16%, 2019
Pressure Range 9 hPa 8 hPa 14 hPa, 2025 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [55%]114 hrs (153%) [52%] 10.9 [100%], 2009 0 [0%], 2015
Wet Hours 1
[Mean rain rate: 2.4 mm/h]		15 hrs (42%) [3%] 2, 2023 , 2009
Cloud Cover Partly Cloudy
Events None
Comments 1830, 23-00 Light-Heavy Showers
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 21st March 2014.
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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose