Daily Report for 25th July 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.8 °C (-0.9) 05:57 15.3 °C (+1.2) 19.4 °C (+4.7), 2019 10.4 °C (-4.3), 2011
Maximum Temperature 22.4 °C (-0.9) 19:00 23.9 °C (+0.9) 36.8 °C (+13.5), 2019 20.2 °C (-3.1), 2023
Mean Temperature 17.6 °C (-0.9) 19.5 °C (+1.0) 28.4 °C, 2019 15.5 °C, 2015
Minimum Humidity 53% 19:41 47% 79%, 2021 32%, 2012
Maximum Humidity 82% 07:29 79% 95%, 2009 70%, 2011
Mean Humidity 70% 63% 90%, 2021 50%, 2012
Minimum Pressure 1013 hPa 21:29 1012 hPa 1017 hPa, 2016 1004 hPa, 2015
Maximum Pressure 1019 hPa 05:57 1018 hPa 1023 hPa, 2009 1011 hPa, 2021
Mean Pressure 1017 hPa 1016 hPa 1020 hPa, 2009 1009 hPa, 2020
Mean Wind Speed 2.6 mph (-1.7) 3.6 mph (-0.7) 6.8 mph, 2022 2.3 mph, 2018
Maximum Wind Speed 8.3 mph 11:59 11.3 mph 18.7 mph, 2020 8.1 mph, 2021
Maximum Gust 12.6 mph 13:08 17.3 mph 27.4 mph, 2016 10.7 mph, 2011
Mean Wind Direction NNW
Rainfall 0.0 mm 61.0 mm (164%) 38.4 mm, 2021
Maximum Hourly Rain n/a 25.5, 2021
Maximum 10-min Rain n/a 10.4, 2021
Maximum Rain Rate n/a 102, 2014
Minimum Dew Point 10.4 °C 05:30 9.2 °C 15.1 °C, 2021 4.3 °C, 2011
Maximum Dew Point 13.4 °C 11:04 14.4 °C 21.1 °C, 2019 11.0 °C, 2011
Mean Dew Point 11.8 °C 11.8 °C 17.4 °C, 2019 7.5 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.8 °C 05:57 15.5 °C 19.4 °C, 2019 10.4 °C, 2011
Day Maximum (09-21) 22.4 °C 19:00 23.9 °C 36.8 °C, 2019 20.2 °C, 2023
Max 10m Temp Rise 0.5 °C 14:27 0.6 °C 1.1 °C, 2012 0.4 °C, 2020
Max 1hr Temp Rise 1.6 °C 10:17 2.1 °C 4.7 °C, 2012 1.4 °C, 2021
Max 1hr Hum Rise 9% 21:49 8% 28%, 2014 7%, 2012
Max 10m Temp Fall 0.6 °C 20:59 0.5 °C 2.6 °C, 2014 0.4 °C, 2010
Max 1hr Temp Fall 2.8 °C 21:16 1.9 °C 5.6 °C, 2014 1.2 °C, 2010
Max 1hr Hum Fall 6% 11:00 10% 20%, 2015 5%, 2021
Max 10m Wind Speed 5.8 mph 11:42 8.3 mph 12.7 mph, 2016 3.5 mph, 2009
Minimum Feels-like 15.3 °C 05:43 16.9 °C 23.1 °C, 2019 10.4 °C, 2011
Maximum Feels-like 25.0 °C 18:43 26.6 °C 44.6 °C, 2019 21.8 °C, 2023
Mean Feels-like 19.8 °C 21.7 °C 34.1 °C, 2019 16.1 °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 8.6 °C (+0.0) 8.6 °C (-0.3) 17.4 °C (+8.8), 2019 4.5 °C (-4.1), 2021
Humidity Range 29% 32% 52%, 2009 16%, 2021
Pressure Range 6 hPa 6 hPa 13 hPa, 2015 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [35%]143 hrs (90%) [39%] 13 [90%], 2012 0 [0%], 2021
Wet Hours 034 hrs (122%) [5.6%] 7, 2021 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy transitioned to Sunny
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 25th July 2017.
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