Daily Report for 19th May 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.5 °C (-2.9) 05:41 9.3 °C (+1.0) 13.5 °C (+4.1), 2022 6.2 °C (-3.2), 2018
Maximum Temperature 19.6 °C (+1.5) 16:29 18.6 °C (+1.4) 26.2 °C (+8.1), 2020 14.3 °C (-3.8), 2015
Mean Temperature 14.0 °C (-0.7) 14.2 °C (+1.2) 19.4 °C, 2014 10.1 °C, 2015
Minimum Humidity 38% 16:45 41% 59%, 2019 31%, 2014
Maximum Humidity 91% 06:50 79% 96%, 2019 77%, 2015
Mean Humidity 63% 59% 81%, 2019 54%, 2014
Minimum Pressure 1015 hPa 10:37 1016 hPa 1029 hPa, 2010 1000 hPa, 2015
Maximum Pressure 1019 hPa 10:12 1020 hPa 1031 hPa, 2010 1007 hPa, 2014
Mean Pressure 1017 hPa 1018 hPa 1030 hPa, 2010 1004 hPa, 2014
Mean Wind Speed 2.4 mph (-2.3) 5.8 mph (+1.1) 7.3 mph, 2015 1.2 mph, 2019
Maximum Wind Speed 8.1 mph 13.8 mph 19.2 mph, 2015 7.7 mph, 2017
Maximum Gust 10.9 mph 19:31 20.0 mph 24.4 mph, 2015 10.9 mph, 2011
Mean Wind Direction N
Rainfall 0.0 mm 7.1 mm (25%) 3.3 mm, 2015
Maximum Hourly Rain n/a 2.4, 2015
Maximum 10-min Rain n/a 2.2, 2015
Maximum Rain Rate n/a 36, 2015
Minimum Dew Point 4.6 °C 16:46 2.8 °C 7.8 °C, 2020 1.4 °C, 2015
Maximum Dew Point 9.3 °C 09:00 9.0 °C 15.4 °C, 2024 5.6 °C, 2015
Mean Dew Point 6.4 °C 5.9 °C 11.8 °C, 2020 3.4 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.5 °C 05:40 9.5 °C 13.5 °C, 2022 6.2 °C, 2018
Day Maximum (09-21) 19.6 °C 16:30 18.6 °C 26.2 °C, 2020 14.3 °C, 2015
Max 10m Temp Rise 0.9 °C 06:48 0.7 °C 1.3 °C, 2009 0.5 °C, 2013
Max 1hr Temp Rise 4.3 °C 07:38 2.9 °C 4.3 °C, 2011 1.4 °C, 2016
Max 1hr Hum Rise 8% 19:52 8% 25%, 2015 6%, 2009
Max 10m Temp Fall 0.3 °C 19:32 0.4 °C 3.1 °C, 2015 0.3 °C, 2010
Max 1hr Temp Fall 1.4 °C 23:10 1.5 °C 4.6 °C, 2015 1.3 °C, 2009
Max 1hr Hum Fall 8% 08:09 9% 19%, 2014 6%, 2013
Max 10m Wind Speed 7.3 mph 23:56 9.8 mph 13.3 mph, 2015 5.1 mph, 2019
Minimum Feels-like 6.0 °C 06:26 8.3 °C 15.7 °C, 2022 3.7 °C, 2015
Maximum Feels-like 19.6 °C 16:27 19.1 °C 29.8 °C, 2020 14.3 °C, 2015
Mean Feels-like 14.1 °C 14.4 °C 21.6 °C, 2020 8.9 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.1 °C (+4.4) 9.3 °C (+0.5) 14.9 °C (+6.2), 2018 6.0 °C (-2.7), 2017
Humidity Range 53% 38% 60%, 2018 28%, 2023
Pressure Range 4 hPa 4 hPa 10 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [63%]135 hrs (119%) [51%] 14.3 [100%], 2018 0.3 [2%], 2019
Wet Hours 05 hrs (20%) [1.1%] 4, 2021 0, 2010
Cloud Cover am: Sunny transitioned to Partly Cloudy
pm: Partly Cloudy
Events None
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 19th May 2011.
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