Daily Report for 25th June 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.6 °C (+3.9) 23:55 12.0 °C (+0.2) 17.8 °C (+5.1), 2020 8.3 °C (-4.4), 2013
Maximum Temperature 23.3 °C (+1.5) 15:41 20.1 °C (-0.7) 31.3 °C (+9.5), 2020 20.2 °C (-1.6), 2013
Mean Temperature 19.6 °C (+2.7) 16.0 °C (-0.3) 24.8 °C, 2020 15.0 °C, 2013
Minimum Humidity 78% 15:48 56% 78%, 2019 25%, 2018
Maximum Humidity 95% 08:26 90% 95%, 2011 69%, 2010
Mean Humidity 88% 75% 88%, 2019 51%, 2018
Minimum Pressure 1016 hPa 05:59 1011 hPa 1026 hPa, 2013 1005 hPa, 2022
Maximum Pressure 1025 hPa 23:58 1017 hPa 1030 hPa, 2013 1011 hPa, 2022
Mean Pressure 1020 hPa 1014 hPa 1029 hPa, 2013 1009 hPa, 2022
Mean Wind Speed 2.0 mph (-2.4) 4.8 mph (+0.4) 6.9 mph, 2022 1.9 mph, 2018
Maximum Wind Speed 9.0 mph 06:01 13.5 mph 18.0 mph, 2023 7.0 mph, 2018
Maximum Gust 15.0 mph 06:02 21.4 mph 27.6 mph, 2023 10.9 mph, 2013
Mean Wind Direction NNE
Rainfall 6.8 mm 59.1 mm (151%) 6.8 mm, 2019
Maximum Hourly Rain 4.4 mm 05:58 4.4 mm, 2019
Maximum 10-min Rain 1.1 mm 05:33 1.4 mm, 2016
Maximum Rain Rate 13 mm/h 03:13 36 mm/h, 2016
Minimum Dew Point 15.0 °C 23:46 8.9 °C 15.0 °C, 2019 3.6 °C, 2013
Maximum Dew Point 20.2 °C 13:54 13.5 °C 20.2 °C, 2019 8.7 °C, 2013
Mean Dew Point 17.5 °C 11.2 °C 17.5 °C, 2019 5.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 18.0 °C * 06:21 12.2 °C 18.0 °C, 2019 8.3 °C, 2013
Day Maximum (09-21) 23.3 °C 15:08 20.0 °C 31.3 °C, 2020 20.2 °C, 2013
Max 10m Temp Rise 0.5 °C 12:53 0.6 °C 0.9 °C, 2023 0.4 °C, 2011
Max 1hr Temp Rise 2.0 °C 13:16 2.1 °C 4.3 °C, 2024 1.4 °C, 2011
Max 1hr Hum Rise 7% 01:01 10% 21%, 2016 5%, 2011
Max 10m Temp Fall 0.4 °C 16:29 0.5 °C 1.1 °C, 2016 0.3 °C, 2025
Max 1hr Temp Fall 1.3 °C 17:01 1.7 °C 3.1 °C, 2016 1.3 °C, 2019
Max 1hr Hum Fall 6% 13:09 11% 22%, 2024 6%, 2010
Max 10m Wind Speed 7.5 mph 06:01 10.0 mph 14.1 mph, 2023 5.0 mph, 2010
Minimum Feels-like 20.6 °C 23:52 12.9 °C 21.5 °C, 2020 7.2 °C, 2013
Maximum Feels-like 30.9 °C 14:29 22.4 °C 36.9 °C, 2023 20.2 °C, 2013
Mean Feels-like 25.3 °C 17.9 °C 28.8 °C, 2020 15.0 °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 6.7 °C (-2.4) 8.0 °C (-0.9) 16.7 °C (+7.7), 2018 6.7 °C (-2.4), 2019
Humidity Range 17% 34% 61%, 2018 17%, 2019
Pressure Range 9 hPa 6 hPa 9 hPa, 2019 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.4 [3%]106 hrs (66%) [28%] 15.2 [100%], 2018 0.4 [3%], 2019
Wet Hours 6
[Mean rain rate: 1.1 mm/h]		71 hrs (230%) [12%] 6, 2019 0, 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments o.night Rain
Extra Comments
Issues None known
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 25th 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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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