Daily Report for 25th May 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.6 °C (+5.3) 05:35 8.5 °C (-0.4) 15.6 °C (+5.3), 2012 4.9 °C (-5.4), 2013
Maximum Temperature 24.3 °C (+5.5) 13:42 15.8 °C (-1.8) 25.9 °C (+7.1), 2017 12.2 °C (-6.6), 2016
Mean Temperature 20.1 °C (+5.4) 12.2 °C (-1.1) 20.1 °C, 2017 10.0 °C, 2013
Minimum Humidity 31% 16:58 57% 73%, 2018 27%, 2011
Maximum Humidity 87% 05:03 89% 97%, 2013 72%, 2011
Mean Humidity 59% 75% 82%, 2018 46%, 2011
Minimum Pressure 1021 hPa 20:02 1013 hPa 1034 hPa, 2020 1010 hPa, 2009
Maximum Pressure 1026 hPa 03:38 1020 hPa 1037 hPa, 2020 1015 hPa, 2010
Mean Pressure 1024 hPa 1016 hPa 1035 hPa, 2020 1012 hPa, 2010
Mean Wind Speed 6.8 mph (+2.1) 4.8 mph (+0.1) 7.1 mph, 2022 1.7 mph, 2018
Maximum Wind Speed 16.3 mph 12.2 mph 16.5 mph, 2022 8.6 mph, 2017
Maximum Gust 27.9 mph 17:24 17.7 mph 31.0 mph, 2009 12.8 mph, 2015
Mean Wind Direction ENE
Rainfall 0.0 mm 44.3 mm (119%) 0.2 mm, 2022
Maximum Hourly Rain n/a 0.2, 2022
Maximum 10-min Rain n/a 0.2, 2022
Maximum Rain Rate n/a n/a
Minimum Dew Point 5.4 °C 17:04 4.8 °C 11.1 °C, 2018 -0.4 °C, 2011
Maximum Dew Point 15.4 °C 00:57 10.1 °C 15.7 °C, 2017 6.6 °C, 2011
Mean Dew Point 11.1 °C 7.5 °C 12.7 °C, 2018 3.0 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.6 °C 05:33 8.8 °C 15.6 °C, 2012 4.9 °C, 2013
Day Maximum (09-21) 24.3 °C 13:42 15.8 °C 25.9 °C, 2017 12.2 °C, 2016
Max 10m Temp Rise 0.5 °C 08:37 0.6 °C 1.1 °C, 2011 0.4 °C, 2010
Max 1hr Temp Rise 1.9 °C 07:43 2.0 °C 5.3 °C, 2011 1.3 °C, 2016
Max 1hr Hum Rise 8% 19:10 8% 17%, 2020 4%, 2015
Max 10m Temp Fall 0.4 °C 19:59 0.4 °C 0.7 °C, 2013 0.2 °C, 2016
Max 1hr Temp Fall 1.3 °C 20:46 1.5 °C 3.3 °C, 2013 0.5 °C, 2016
Max 1hr Hum Fall 15% 08:02 10% 18%, 2014 5%, 2016
Max 10m Wind Speed 11.9 mph 18:28 8.0 mph 12.7 mph, 2022 6.4 mph, 2015
Minimum Feels-like 18.6 °C 23:56 7.4 °C 18.6 °C, 2012 0.8 °C, 2013
Maximum Feels-like 25.8 °C 12:25 17.2 °C 29.1 °C, 2017 12.3 °C, 2016
Mean Feels-like 22.1 °C 12.7 °C 22.5 °C, 2017 9.0 °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 8.7 °C (+0.1) 7.3 °C (-1.5) 16.8 °C (+8.2), 2020 3.4 °C (-5.2), 2016
Humidity Range 56% 32% 57%, 2013 18%, 2018
Pressure Range 5 hPa 7 hPa 16 hPa, 2011 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 14 [96%]94 hrs (62%) [27%] 14.3 [98%], 2017 0 [0%], 2016
Wet Hours 037 hrs (115%) [6.2%] 0.5, 2022 0, 2010
Cloud Cover Sunny
Events Maximum possible sunshine
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 25th 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