Daily Report for 23rd July 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 17.9 °C (+3.2) 05:13 15.3 °C (+1.2) 19.4 °C (+4.7), 2013 10.9 °C (-3.8), 2011
Maximum Temperature 31.2 °C (+7.9) 15:38 27.3 °C (+4.3) 32.6 °C (+9.3), 2019 18.0 °C (-5.3), 2011
Mean Temperature 25.1 °C (+5.5) 21.6 °C (+2.7) 25.1 °C, 2018 14.9 °C, 2011
Minimum Humidity 43% 15:34 39% 66%, 2024 28%, 2012
Maximum Humidity 80% 05:28 84% 96%, 2019 73%, 2012
Mean Humidity 57% 61% 82%, 2023 49%, 2012
Minimum Pressure 1016 hPa 18:44 1017 hPa 1019 hPa, 2012 1001 hPa, 2009
Maximum Pressure 1018 hPa 07:06 1021 hPa 1025 hPa, 2012 1006 hPa, 2023
Mean Pressure 1017 hPa 1019 hPa 1023 hPa, 2012 1004 hPa, 2023
Mean Wind Speed 3.8 mph (-0.5) 3.0 mph (-1.3) 8.0 mph, 2023 1.7 mph, 2024
Maximum Wind Speed 11.4 mph 18:23 10.3 mph 16.5 mph, 2023 8.0 mph, 2010
Maximum Gust 18.4 mph 18:10 15.8 mph 26.5 mph, 2023 11.4 mph, 2010
Mean Wind Direction SW
Rainfall 0.0 mm 18.4 mm (54%) 12.2 mm, 2013
Maximum Hourly Rain n/a 4.6, 2013
Maximum 10-min Rain n/a 2.7, 2013
Maximum Rain Rate n/a 60, 2013
Minimum Dew Point 11.1 °C 22:33 10.3 °C 14.6 °C, 2019 3.5 °C, 2011
Maximum Dew Point 18.3 °C 09:51 15.4 °C 20.8 °C, 2013 10.7 °C, 2015
Mean Dew Point 15.5 °C 13.0 °C 17.1 °C, 2013 7.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 17.9 °C 05:14 15.3 °C 19.4 °C, 2013 10.9 °C, 2011
Day Maximum (09-21) 31.2 °C 15:38 27.3 °C 32.6 °C, 2019 18.0 °C, 2011
Max 10m Temp Rise 0.7 °C 07:24 0.7 °C 0.9 °C, 2009 0.5 °C, 2022
Max 1hr Temp Rise 2.8 °C 07:59 2.6 °C 3.9 °C, 2016 1.8 °C, 2021
Max 1hr Hum Rise 16% 23:51 12% 16%, 2018 6%, 2015
Max 10m Temp Fall 0.5 °C 00:10 0.6 °C 1.4 °C, 2009 0.4 °C, 2014
Max 1hr Temp Fall 1.9 °C 21:12 2.2 °C 2.7 °C, 2009 1.1 °C, 2024
Max 1hr Hum Fall 8% 08:15 12% 15%, 2013 8%, 2018
Max 10m Wind Speed 8.4 mph 18:27 7.6 mph 12.7 mph, 2023 4.0 mph, 2009
Minimum Feels-like 21.1 °C 05:05 17.6 °C 23.2 °C, 2013 11.7 °C, 2011
Maximum Feels-like 36.8 °C 15:38 30.4 °C 38.1 °C, 2019 18.1 °C, 2011
Mean Feels-like 29.4 °C 24.4 °C 30.2 °C, 2019 15.4 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.3 °C (+4.8) 12.0 °C (+3.1) 16.7 °C (+8.2), 2019 6.4 °C (-2.1), 2024
Humidity Range 37% 45% 61%, 2019 27%, 2021
Pressure Range 2 hPa 3 hPa 9 hPa, 2021 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [69%]204 hrs (139%) [60%] 14.5 [100%], 2019 1 [7%], 2010
Wet Hours 04.5 hrs (18%) [0.8%] 4, 2013 0, 2010
Cloud Cover am: Sunny
pm: Partly Cloudy
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 23rd July 2018.
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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