Daily Report for 6th July 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.2 °C (-0.4) 23:54 14.1 °C (+0.7) 18.1 °C (+4.5), 2017 10.5 °C (-3.1), 2016
Maximum Temperature 18.1 °C (-4.6) 15:01 21.5 °C (-1.1) 31.2 °C (+8.5), 2017 18.1 °C (-4.6), 2021
Mean Temperature 15.2 °C (-2.5) 17.5 °C (-0.2) 23.9 °C, 2017 15.2 °C, 2021
Minimum Humidity 68% 15:11 62% 68%, 2021 33%, 2018
Maximum Humidity 94% 00:56 92% 94%, 2021 68%, 2010
Mean Humidity 86% 79% 86%, 2021 52%, 2010
Minimum Pressure 994 hPa 07:32 1007 hPa 1028 hPa, 2013 994 hPa, 2021
Maximum Pressure 1008 hPa 23:33 1014 hPa 1031 hPa, 2013 1007 hPa, 2011
Mean Pressure 1001 hPa 1011 hPa 1029 hPa, 2013 1001 hPa, 2021
Mean Wind Speed 6.4 mph (+2.1) 3.9 mph (-0.4) 8.3 mph, 2011 1.7 mph, 2018
Maximum Wind Speed 14.6 mph 02:42 12.1 mph 19.4 mph, 2011 7.4 mph, 2013
Maximum Gust 21.7 mph 02:41 17.9 mph 27.0 mph, 2011 11.6 mph, 2019
Mean Wind Direction WSW
Rainfall 9.4 mm 15.6 mm (175%) 9.4 mm, 2021
Maximum Hourly Rain 2.0 mm 01:01 3.3 mm, 2009
Maximum 10-min Rain 0.7 mm 12:56 2.8 mm, 2009
Maximum Rain Rate 4.8 mm/h 12:52 49 mm/h, 2009
Minimum Dew Point 11.0 °C 23:29 11.8 °C 11.8 °C, 2018 5.0 °C, 2010
Maximum Dew Point 14.3 °C 01:35 15.5 °C 17.3 °C, 2018 9.3 °C, 2010
Mean Dew Point 12.8 °C 13.7 °C 14.6 °C, 2018 7.3 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.4 °C * 07:04 14.3 °C 18.1 °C, 2017 10.5 °C, 2016
Day Maximum (09-21) 18.1 °C 15:45 21.5 °C 31.2 °C, 2017 18.1 °C, 2021
Max 10m Temp Rise 0.8 °C 16:08 0.7 °C 0.8 °C, 2009 0.5 °C, 2010
Max 1hr Temp Rise 2.5 °C 14:51 2.3 °C 3.1 °C, 2013 1.7 °C, 2009
Max 1hr Hum Rise 12% 16:08 11% 20%, 2018 5%, 2010
Max 10m Temp Fall 1.2 °C 15:26 0.7 °C 1.2 °C, 2009 0.4 °C, 2010
Max 1hr Temp Fall 2.1 °C 15:48 1.9 °C 3.2 °C, 2017 1.3 °C, 2010
Max 1hr Hum Fall 15% 15:08 11% 15%, 2021 7%, 2022
Max 10m Wind Speed 11.2 mph 17:17 9.0 mph 12.4 mph, 2011 5.0 mph, 2019
Minimum Feels-like 15.0 °C 23:51 16.6 °C 20.4 °C, 2017 10.5 °C, 2016
Maximum Feels-like 21.2 °C 14:48 25.4 °C 36.3 °C, 2017 20.8 °C, 2011
Mean Feels-like 17.9 °C 20.7 °C 27.7 °C, 2017 16.8 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.9 °C (-4.2) 7.3 °C (-1.7) 15.3 °C (+6.2), 2013 4.9 °C (-4.2), 2021
Humidity Range 26% 30% 57%, 2018 19%, 2022
Pressure Range 14 hPa 6 hPa 14 hPa, 2021 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [13%]22 hrs (57%) [24%] 14 [93%], 2018 2 [13%], 2021
Wet Hours 7
[Mean rain rate: 1.3 mm/h]		15 hrs (228%) [10%] 10, 2012 0, 2010
Cloud Cover Overcast with periods of Partly Cloudy
Events None
Comments Showers
Extra Comments
Issues rn gauge blockage begins, rn stopped at 19z but still tipping
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 19.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 6th July 2021.
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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