Daily Report for 28th July 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.9 °C (+2.2) 23:51 15.8 °C (+1.6) 16.9 °C (+2.2), 2018 11.6 °C (-3.1), 2024
Maximum Temperature 22.6 °C (-0.7) 13:39 27.7 °C (+4.7) 26.6 °C (+3.3), 2024 19.1 °C (-4.2), 2015
Mean Temperature 19.6 °C (+0.7) 22.0 °C (+3.1) 19.8 °C, 2024 16.1 °C, 2015
Minimum Humidity 38% 13:42 39% 65%, 2021 34%, 2012
Maximum Humidity 86% 05:06 85% 93%, 2024 68%, 2012
Mean Humidity 62% 61% 83%, 2021 51%, 2012
Minimum Pressure 1004 hPa 05:46 1016 hPa 1022 hPa, 2024 1002 hPa, 2013
Maximum Pressure 1010 hPa 22:22 1020 hPa 1028 hPa, 2024 1008 hPa, 2013
Mean Pressure 1007 hPa 1018 hPa 1026 hPa, 2024 1006 hPa, 2015
Mean Wind Speed 10.0 mph (+5.7) 3.3 mph (-1.0) 10.0 mph, 2018 0.9 mph, 2024
Maximum Wind Speed 21.4 mph 18:00 10.9 mph 21.4 mph, 2018 6.7 mph, 2011
Maximum Gust 39.2 mph 14:59 16.9 mph 39.2 mph, 2018 10.0 mph, 2011
Mean Wind Direction SW
Rainfall 0.0 mm 25.7 mm (62%) 10.8 mm, 2021
Maximum Hourly Rain n/a 7.7, 2021
Maximum 10-min Rain n/a 2.6, 2021
Maximum Rain Rate n/a 30, 2021
Minimum Dew Point 7.4 °C 13:44 10.8 °C 14.5 °C, 2023 2.3 °C, 2012
Maximum Dew Point 16.3 °C 06:12 16.0 °C 17.6 °C, 2023 10.0 °C, 2012
Mean Dew Point 11.8 °C 13.4 °C 15.8 °C, 2023 6.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 17.2 °C * 07:35 15.8 °C 17.2 °C, 2018 11.6 °C, 2024
Day Maximum (09-21) 22.6 °C 13:50 27.7 °C 26.6 °C, 2024 19.1 °C, 2015
Max 10m Temp Rise 0.6 °C 12:16 0.7 °C 1.1 °C, 2009 0.5 °C, 2011
Max 1hr Temp Rise 1.6 °C 08:36 2.6 °C 4.3 °C, 2024 1.4 °C, 2015
Max 1hr Hum Rise 10% 14:42 13% 25%, 2021 6%, 2009
Max 10m Temp Fall 0.8 °C 07:13 0.6 °C 2.2 °C, 2021 0.4 °C, 2009
Max 1hr Temp Fall 1.6 °C 07:30 2.3 °C 4.7 °C, 2021 1.4 °C, 2016
Max 1hr Hum Fall 16% 07:11 12% 16%, 2018 7%, 2019
Max 10m Wind Speed 18.6 mph 17:18 8.1 mph 18.6 mph, 2018 4.7 mph, 2024
Minimum Feels-like 18.8 °C 23:44 18.4 °C 20.1 °C, 2023 12.9 °C, 2024
Maximum Feels-like 24.6 °C 00:35 31.0 °C 30.6 °C, 2024 19.5 °C, 2015
Mean Feels-like 21.9 °C 25.1 °C 23.6 °C, 2023 16.8 °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 5.7 °C (-2.8) 11.9 °C (+3.1) 15.0 °C (+6.5), 2024 5.4 °C (-3.1), 2015
Humidity Range 48% 46% 48%, 2018 25%, 2021
Pressure Range 6 hPa 4 hPa 11 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [56%]252 hrs (142%) [61%] 11 [77%], 2024 0.3 [2%], 2019
Wet Hours 06.5 hrs (21%) [1%] 3, 2021 0, 2009
Cloud Cover am: Mostly 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 28th 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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