Daily Report for 7th July 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 18.8 °C (+5.1) 05:35 15.7 °C (+2.2) 18.8 °C (+5.1), 2017 9.4 °C (-4.3), 2020
Maximum Temperature 29.6 °C (+6.9) 16:02 26.5 °C (+3.9) 30.3 °C (+7.6), 2018 17.8 °C (-4.9), 2024
Mean Temperature 24.1 °C (+6.0) 21.0 °C (+3.0) 24.3 °C, 2018 14.2 °C, 2024
Minimum Humidity 32% 16:24 42% 75%, 2009 32%, 2017
Maximum Humidity 72% 05:34 76% 94%, 2019 68%, 2016
Mean Humidity 52% 58% 88%, 2009 52%, 2017
Minimum Pressure 1012 hPa 18:00 1015 hPa 1030 hPa, 2013 1002 hPa, 2009
Maximum Pressure 1018 hPa 23:58 1020 hPa 1033 hPa, 2022 1005 hPa, 2011
Mean Pressure 1015 hPa 1018 hPa 1031 hPa, 2013 1004 hPa, 2011
Mean Wind Speed 4.0 mph (-0.3) 3.3 mph (-1.0) 7.7 mph, 2011 2.4 mph, 2018
Maximum Wind Speed 10.3 mph 18:57 9.7 mph 18.1 mph, 2015 9.8 mph, 2013
Maximum Gust 14.7 mph 19:34 15.0 mph 28.4 mph, 2015 13.0 mph, 2014
Mean Wind Direction NW
Rainfall 0.0 mm 0.0 mm (0%) 7.1 mm, 2009
Maximum Hourly Rain n/a 4.4, 2024
Maximum 10-min Rain n/a 1.7, 2009
Maximum Rain Rate n/a 33, 2009
Minimum Dew Point 10.6 °C 16:45 9.2 °C 11.9 °C, 2009 4.7 °C, 2015
Maximum Dew Point 16.1 °C 00:03 14.4 °C 17.5 °C, 2018 11.1 °C, 2014
Mean Dew Point 13.1 °C 12.0 °C 15.0 °C, 2018 9.4 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 18.8 °C 05:35 15.7 °C 18.8 °C, 2017 9.4 °C, 2020
Day Maximum (09-21) 29.6 °C 16:02 26.5 °C 30.3 °C, 2018 17.8 °C, 2024
Max 10m Temp Rise 0.5 °C 09:02 0.7 °C 0.9 °C, 2023 0.5 °C, 2015
Max 1hr Temp Rise 2.1 °C 09:52 2.4 °C 4.2 °C, 2023 1.5 °C, 2021
Max 1hr Hum Rise 8% 20:58 7% 22%, 2020 5%, 2021
Max 10m Temp Fall 0.5 °C 20:01 0.6 °C 1.9 °C, 2024 0.3 °C, 2010
Max 1hr Temp Fall 2.3 °C 20:52 2.1 °C 4.2 °C, 2024 1.2 °C, 2010
Max 1hr Hum Fall 8% 10:51 9% 17%, 2023 7%, 2010
Max 10m Wind Speed 7.4 mph 19:05 7.1 mph 15.0 mph, 2015 7.4 mph, 2017
Minimum Feels-like 21.9 °C 05:21 17.2 °C 21.9 °C, 2017 8.0 °C, 2020
Maximum Feels-like 31.8 °C 15:44 29.2 °C 34.2 °C, 2018 20.3 °C, 2024
Mean Feels-like 26.9 °C 23.4 °C 28.3 °C, 2018 16.1 °C, 2024
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.8 °C (+1.7) 10.8 °C (+1.7) 18.8 °C (+9.7), 2023 4.2 °C (-4.9), 2009
Humidity Range 40% 35% 54%, 2018 18%, 2009
Pressure Range 6 hPa 5 hPa 10 hPa, 2021 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12 [80%]65 hrs (144%) [62%] 14.5 [97%], 2023 1 [7%], 2012
Wet Hours 00 hrs (0%) [0%] 5, 2020 0, 2010
Cloud Cover Sunny with periods of Hazy
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 7th 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