Daily Report for 1st June 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.9 °C (+1.0) 05:43 11.9 °C (+1.0) 15.7 °C (+4.8), 2018 8.0 °C (-2.9), 2011
Maximum Temperature 27.4 °C (+8.0) 17:20 27.4 °C (+7.9) 27.4 °C (+8.0), 2019 13.3 °C (-6.1), 2016
Mean Temperature 20.5 °C (+4.5) 20.5 °C (+4.4) 20.5 °C, 2019 11.7 °C, 2015
Minimum Humidity 39% 17:18 39% 88%, 2016 31%, 2021
Maximum Humidity 86% 05:48 86% 94%, 2010 75%, 2011
Mean Humidity 64% 64% 90%, 2016 58%, 2011
Minimum Pressure 1016 hPa 23:56 1016 hPa 1027 hPa, 2011 1005 hPa, 2015
Maximum Pressure 1023 hPa 06:10 1023 hPa 1032 hPa, 2011 1015 hPa, 2015
Mean Pressure 1020 hPa 1020 hPa 1030 hPa, 2011 1012 hPa, 2015
Mean Wind Speed 4.0 mph (-0.4) 4.0 mph (-0.4) 8.5 mph, 2015 1.6 mph, 2022
Maximum Wind Speed 13.4 mph 18:26 13.4 mph 22.1 mph, 2015 7.8 mph, 2012
Maximum Gust 19.6 mph 18:27 19.6 mph 29.7 mph, 2015 10.9 mph, 2012
Mean Wind Direction SSW
Rainfall 0.0 mm 0.0 mm (0%) 5.5 mm, 2010
Maximum Hourly Rain n/a 1.4, 2010
Maximum 10-min Rain n/a 0.3, 2010
Maximum Rain Rate n/a 2, 2010
Minimum Dew Point 9.6 °C 05:28 9.6 °C 14.5 °C, 2018 2.3 °C, 2011
Maximum Dew Point 15.0 °C 22:56 15.0 °C 17.0 °C, 2018 7.5 °C, 2015
Mean Dew Point 12.1 °C 12.1 °C 15.6 °C, 2018 4.1 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.9 °C 05:43 11.9 °C 15.7 °C, 2018 8.0 °C, 2011
Day Maximum (09-21) * 26.4 °C * 17:21 26.4 °C 26.4 °C, 2019 13.3 °C, 2016
Max 10m Temp Rise 0.7 °C 16:38 0.7 °C 0.9 °C, 2009 0.2 °C, 2010
Max 1hr Temp Rise 2.2 °C 17:19 2.2 °C 4.2 °C, 2011 0.5 °C, 2016
Max 1hr Hum Rise 8% 19:34 8% 17%, 2022 2%, 2016
Max 10m Temp Fall 0.4 °C 18:20 0.4 °C 0.9 °C, 2022 0.2 °C, 2010
Max 1hr Temp Fall 1.6 °C 19:07 1.6 °C 3.4 °C, 2022 0.6 °C, 2016
Max 1hr Hum Fall 9% 17:18 9% 20%, 2021 1%, 2016
Max 10m Wind Speed 8.6 mph 17:12 8.6 mph 16.8 mph, 2015 5.7 mph, 2012
Minimum Feels-like 13.0 °C 05:43 13.0 °C 19.4 °C, 2018 5.2 °C, 2015
Maximum Feels-like 30.0 °C 18:03 30.0 °C 30.0 °C, 2019 15.3 °C, 2016
Mean Feels-like 22.0 °C 22.0 °C 23.3 °C, 2018 11.1 °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 15.5 °C (+7.0) 15.5 °C (+6.9) 15.5 °C (+7.0), 2019 2.1 °C (-6.4), 2016
Humidity Range 47% 47% 53%, 2021 3%, 2016
Pressure Range 7 hPa 7 hPa 10 hPa, 2015 1 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12 [81%]12 hrs (189%) [81%] 14.8 [100%], 2020 0 [0%], 2010
Wet Hours 00 hrs (0%) [0%] 6, 2010 0, 2009
Cloud Cover Mostly Sunny with periods of Hazy
Events None
Comments -
Extra Comments
Issues 09-1630 power outage w full data loss. Corrections made
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 18.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 1st June 2019.
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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Webcam Summary of Cloud Conditions

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