Daily Report for 28th May 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.8 °C (+2.2) 05:27 9.0 °C (-0.0) 14.8 °C (+4.2), 2018 7.2 °C (-3.5), 2023
Maximum Temperature 26.9 °C (+7.7) 13:37 16.9 °C (-0.9) 26.9 °C (+7.7), 2012 13.1 °C (-6.1), 2013
Mean Temperature 20.8 °C (+4.9) 13.1 °C (-0.5) 20.8 °C, 2012 11.4 °C, 2013
Minimum Humidity 35% 15:46 54% 91%, 2014 33%, 2020
Maximum Humidity 78% 05:47 88% 98%, 2014 75%, 2015
Mean Humidity 53% 72% 96%, 2014 49%, 2015
Minimum Pressure 1015 hPa 20:02 1013 hPa 1032 hPa, 2020 998 hPa, 2013
Maximum Pressure 1018 hPa 07:54 1020 hPa 1037 hPa, 2020 1004 hPa, 2013
Mean Pressure 1016 hPa 1016 hPa 1035 hPa, 2020 1000 hPa, 2013
Mean Wind Speed 2.6 mph (-2.1) 4.8 mph (+0.1) 7.2 mph, 2011 0.8 mph, 2021
Maximum Wind Speed 10.2 mph 12.3 mph 17.3 mph, 2025 5.7 mph, 2021
Maximum Gust 13.2 mph 14:53 17.9 mph 27.6 mph, 2024 9.1 mph, 2021
Mean Wind Direction WSW
Rainfall 0.0 mm 44.3 mm (107%) 14.7 mm, 2013
Maximum Hourly Rain n/a 4.9, 2013
Maximum 10-min Rain n/a 2.5, 2017
Maximum Rain Rate n/a 30, 2017
Minimum Dew Point 7.3 °C 00:01 4.9 °C 13.4 °C, 2018 0.2 °C, 2010
Maximum Dew Point 13.0 °C 10:43 10.4 °C 19.8 °C, 2018 7.3 °C, 2010
Mean Dew Point 10.4 °C 7.7 °C 16.0 °C, 2018 3.4 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.8 °C 05:26 9.3 °C 14.8 °C, 2018 7.2 °C, 2023
Day Maximum (09-21) 26.9 °C 13:37 16.9 °C 26.9 °C, 2012 12.2 °C, 2013
Max 10m Temp Rise 0.7 °C 06:44 0.6 °C 0.8 °C, 2009 0.3 °C, 2014
Max 1hr Temp Rise 3.2 °C 07:23 2.1 °C 3.2 °C, 2012 0.9 °C, 2014
Max 1hr Hum Rise 7% 01:15 7% 22%, 2021 2%, 2014
Max 10m Temp Fall 0.5 °C 15:04 0.4 °C 1.3 °C, 2025 0.2 °C, 2013
Max 1hr Temp Fall 2.3 °C 21:30 1.5 °C 3.3 °C, 2018 0.4 °C, 2014
Max 1hr Hum Fall 9% 07:30 11% 21%, 2021 3%, 2014
Max 10m Wind Speed 7.2 mph 15:36 8.1 mph 12.7 mph, 2024 4.2 mph, 2021
Minimum Feels-like 13.5 °C 05:18 8.1 °C 17.9 °C, 2018 5.2 °C, 2023
Maximum Feels-like 29.3 °C 13:35 18.2 °C 31.9 °C, 2018 13.7 °C, 2013
Mean Feels-like 22.3 °C 13.6 °C 23.9 °C, 2018 12.1 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 14.1 °C (+5.6) 7.9 °C (-0.9) 14.7 °C (+6.2), 2023 3.0 °C (-5.5), 2013
Humidity Range 43% 34% 56%, 2023 7%, 2014
Pressure Range 3 hPa 7 hPa 10 hPa, 2025 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 14 [95%]137 hrs (81%) [35%] 14 [95%], 2012 0 [0%], 2013
Wet Hours 037 hrs (103%) [5.5%] 12, 2013 0, 2009
Cloud Cover am: Sunny
pm: Mostly 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 28th May 2012.
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