Daily Report for 28th June 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.4 °C (-0.6) 23:54 12.4 °C (+0.3) 18.2 °C (+5.2), 2023 11.1 °C (-1.9), 2016
Maximum Temperature 20.0 °C (-2.1) 13:09 21.7 °C (+0.7) 29.8 °C (+7.7), 2010 16.2 °C (-5.9), 2017
Mean Temperature 16.0 °C (-1.3) 17.1 °C (+0.5) 22.5 °C, 2010 14.8 °C, 2017
Minimum Humidity 51% 12:40 52% 82%, 2021 28%, 2010
Maximum Humidity 86% 22:36 88% 97%, 2009 71%, 2010
Mean Humidity 70% 70% 92%, 2021 47%, 2010
Minimum Pressure 1007 hPa 00:40 1012 hPa 1023 hPa, 2018 997 hPa, 2017
Maximum Pressure 1012 hPa 15:31 1017 hPa 1028 hPa, 2019 1003 hPa, 2017
Mean Pressure 1010 hPa 1014 hPa 1025 hPa, 2018 998 hPa, 2017
Mean Wind Speed 9.3 mph (+4.9) 4.8 mph (+0.4) 9.3 mph, 2020 3.1 mph, 2011
Maximum Wind Speed 19.7 mph 15:02 13.6 mph 19.7 mph, 2020 7.9 mph, 2017
Maximum Gust 32.3 mph 15:02 21.2 mph 32.3 mph, 2020 12.5 mph, 2014
Mean Wind Direction SW
Rainfall 5.5 mm 45.1 mm (103%) 9.4 mm, 2021
Maximum Hourly Rain 2.8 mm 21:32 6.3 mm, 2011
Maximum 10-min Rain 2.6 mm 21:29 3.0 mm, 2011
Maximum Rain Rate 42 mm/h 21:27 42 mm/h, 2020
Minimum Dew Point 8.7 °C 04:45 9.1 °C 15.9 °C, 2023 5.1 °C, 2016
Maximum Dew Point 14.2 °C 15:45 13.5 °C 19.9 °C, 2012 11.8 °C, 2016
Mean Dew Point 10.4 °C 11.3 °C 17.1 °C, 2023 8.4 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 12.6 °C * 05:35 12.6 °C 18.5 °C, 2011 11.1 °C, 2016
Day Maximum (09-21) 20.0 °C 13:09 21.7 °C 29.8 °C, 2010 16.2 °C, 2017
Max 10m Temp Rise 0.6 °C 13:47 0.6 °C 1.1 °C, 2009 0.2 °C, 2017
Max 1hr Temp Rise 1.7 °C 09:44 2.3 °C 3.0 °C, 2018 0.5 °C, 2017
Max 1hr Hum Rise 19% 14:37 11% 20%, 2016 1%, 2017
Max 10m Temp Fall 1.1 °C 14:32 0.7 °C 1.1 °C, 2020 0.2 °C, 2017
Max 1hr Temp Fall 2.3 °C 22:19 2.0 °C 2.9 °C, 2016 0.6 °C, 2017
Max 1hr Hum Fall 18% 16:45 13% 20%, 2009 3%, 2017
Max 10m Wind Speed 16.7 mph 13:24 9.9 mph 16.7 mph, 2020 5.6 mph, 2011
Minimum Feels-like 13.4 °C 05:22 13.3 °C 22.9 °C, 2023 11.1 °C, 2016
Maximum Feels-like 21.3 °C 13:19 24.2 °C 35.2 °C, 2012 19.4 °C, 2017
Mean Feels-like 17.5 °C 19.1 °C 26.4 °C, 2012 16.4 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.6 °C (-1.5) 9.3 °C (+0.4) 14.6 °C (+5.5), 2018 3.5 °C (-5.6), 2017
Humidity Range 35% 37% 54%, 2012 10%, 2017
Pressure Range 4 hPa 5 hPa 14 hPa, 2016 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [40%]184 hrs (102%) [44%] 14.5 [96%], 2010 0 [0%], 2017
Wet Hours 1
[Mean rain rate: 6 mm/h]		37 hrs (106%) [5.5%] 7, 2017 0, 2010
Cloud Cover Partly Cloudy
Events None
Comments Heavy Showers, possible thundery
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 28th June 2020.
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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