Daily Report for 22nd May 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.0 °C (+1.2) 23:59 7.7 °C (-0.8) 14.2 °C (+4.4), 2020 4.8 °C (-5.0), 2025
Maximum Temperature 22.1 °C (+3.7) 14:42 19.8 °C (+2.5) 25.2 °C (+6.8), 2017 14.2 °C (-4.2), 2013
Mean Temperature 16.1 °C (+2.5) 14.1 °C (+0.8) 19.1 °C, 2020 10.7 °C, 2021
Minimum Humidity 53% 15:28 43% 91%, 2024 35%, 2011
Maximum Humidity 84% 23:16 89% 96%, 2024 75%, 2020
Mean Humidity 70% 65% 94%, 2024 54%, 2019
Minimum Pressure 1015 hPa 03:43 1016 hPa 1027 hPa, 2010 997 hPa, 2021
Maximum Pressure 1022 hPa 23:55 1022 hPa 1031 hPa, 2010 1003 hPa, 2014
Mean Pressure 1017 hPa 1019 hPa 1029 hPa, 2010 1001 hPa, 2014
Mean Wind Speed 5.1 mph (+0.4) 3.9 mph (-0.8) 9.1 mph, 2011 2.0 mph, 2025
Maximum Wind Speed 15.9 mph 20:03 11.7 mph 21.0 mph, 2011 9.4 mph, 2010
Maximum Gust 26.5 mph 19:20 18.4 mph 33.8 mph, 2011 13.6 mph, 2010
Mean Wind Direction NNE
Rainfall 0.0 mm 14.1 mm (43%) 12.1 mm, 2024
Maximum Hourly Rain n/a 3.4, 2024
Maximum 10-min Rain n/a 1.7, 2014
Maximum Rain Rate n/a 66, 2024
Minimum Dew Point 8.1 °C 05:21 4.5 °C 11.6 °C, 2024 0.0 °C, 2013
Maximum Dew Point 13.8 °C 12:47 10.1 °C 15.5 °C, 2012 8.2 °C, 2009
Mean Dew Point 10.4 °C 7.1 °C 12.9 °C, 2024 5.4 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.6 °C * 05:28 8.1 °C 17.2 °C, 2020 4.8 °C, 2025
Day Maximum (09-21) 22.1 °C 14:42 19.8 °C 25.2 °C, 2017 14.2 °C, 2013
Max 10m Temp Rise 0.8 °C 12:14 0.8 °C 1.0 °C, 2012 0.2 °C, 2024
Max 1hr Temp Rise 2.3 °C 09:00 2.9 °C 3.9 °C, 2012 0.6 °C, 2024
Max 1hr Hum Rise 10% 20:44 11% 21%, 2014 2%, 2024
Max 10m Temp Fall 0.9 °C 17:59 0.7 °C 2.3 °C, 2014 0.3 °C, 2015
Max 1hr Temp Fall 2.6 °C 21:13 2.2 °C 4.4 °C, 2014 0.7 °C, 2024
Max 1hr Hum Fall 8% 13:02 16% 24%, 2022 3%, 2024
Max 10m Wind Speed 11.1 mph 19:28 8.6 mph 14.7 mph, 2020 6.2 mph, 2012
Minimum Feels-like 11.6 °C 23:59 6.4 °C 15.2 °C, 2020 3.6 °C, 2025
Maximum Feels-like 25.1 °C 14:40 20.8 °C 28.7 °C, 2012 14.2 °C, 2013
Mean Feels-like 17.6 °C 14.3 °C 20.2 °C, 2020 9.8 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.1 °C (+2.5) 12.1 °C (+3.3) 14.4 °C (+5.8), 2017 1.9 °C (-6.7), 2024
Humidity Range 31% 46% 58%, 2022 5%, 2024
Pressure Range 8 hPa 6 hPa 13 hPa, 2021 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 14 [97%]209 hrs (158%) [68%] 14.5 [100%], 2010 0 [0%], 2024
Wet Hours 017 hrs (58%) [3.1%] 12, 2024 0, 2009
Cloud Cover am: Mostly Sunny
pm: Sunny
Events Maximum possible sunshine
Comments -
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 22nd May 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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose