Daily Report for 3rd August 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 17.8 °C (+3.2) 05:42 15.6 °C (+1.1) 18.2 °C (+3.6), 2022 11.6 °C (-3.0), 2021
Maximum Temperature 32.2 °C (+8.9) 16:20 29.6 °C (+6.3) 32.2 °C (+8.9), 2018 20.4 °C (-2.9), 2023
Mean Temperature 24.9 °C (+6.1) 22.5 °C (+3.7) 24.9 °C, 2018 16.4 °C, 2021
Minimum Humidity 36% 16:35 39% 65%, 2022 33%, 2014
Maximum Humidity 90% 06:24 87% 95%, 2021 74%, 2014
Mean Humidity 64% 63% 80%, 2022 52%, 2014
Minimum Pressure 1021 hPa 17:37 1021 hPa 1021 hPa, 2018 995 hPa, 2023
Maximum Pressure 1024 hPa 01:07 1024 hPa 1024 hPa, 2018 1010 hPa, 2016
Mean Pressure 1023 hPa 1023 hPa 1023 hPa, 2018 1006 hPa, 2023
Mean Wind Speed 1.6 mph (-2.4) 2.9 mph (-1.1) 11.8 mph, 2016 1.6 mph, 2018
Maximum Wind Speed 10.0 mph 19:06 10.4 mph 24.2 mph, 2016 9.0 mph, 2019
Maximum Gust 17.3 mph 19:09 16.9 mph 38.7 mph, 2016 12.5 mph, 2019
Mean Wind Direction NW
Rainfall 0.0 mm 0.0 mm (0%) 0.9 mm, 2013
Maximum Hourly Rain n/a 0.9, 2013
Maximum 10-min Rain n/a 0.9, 2013
Maximum Rain Rate n/a 9, 2013
Minimum Dew Point 15.0 °C 16:35 12.2 °C 15.3 °C, 2022 5.8 °C, 2014
Maximum Dew Point 18.8 °C 10:09 16.8 °C 20.1 °C, 2022 11.0 °C, 2014
Mean Dew Point 16.9 °C 14.5 °C 18.0 °C, 2022 8.3 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 17.8 °C 05:43 15.6 °C 18.3 °C, 2016 11.6 °C, 2021
Day Maximum (09-21) 32.2 °C 16:20 29.6 °C 32.2 °C, 2018 20.4 °C, 2023
Max 10m Temp Rise 0.5 °C 08:34 0.6 °C 1.0 °C, 2024 0.4 °C, 2017
Max 1hr Temp Rise 2.0 °C 09:26 2.7 °C 3.3 °C, 2011 1.2 °C, 2016
Max 1hr Hum Rise 13% 20:03 11% 16%, 2020 4%, 2017
Max 10m Temp Fall 0.6 °C 19:20 0.6 °C 1.1 °C, 2016 0.3 °C, 2010
Max 1hr Temp Fall 3.4 °C 19:58 2.9 °C 3.4 °C, 2018 1.0 °C, 2010
Max 1hr Hum Fall 9% 09:24 14% 18%, 2016 6%, 2022
Max 10m Wind Speed 8.1 mph 19:11 7.6 mph 20.1 mph, 2016 6.3 mph, 2021
Minimum Feels-like 22.3 °C 05:33 18.7 °C 22.9 °C, 2022 13.0 °C, 2009
Maximum Feels-like 37.0 °C 14:20 33.6 °C 37.0 °C, 2018 23.7 °C, 2010
Mean Feels-like 30.2 °C 26.4 °C 30.2 °C, 2018 18.7 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 14.4 °C (+5.7) 13.9 °C (+5.2) 14.4 °C (+5.7), 2018 5.8 °C (-2.9), 2017
Humidity Range 54% 48% 54%, 2018 24%, 2022
Pressure Range 4 hPa 3 hPa 19 hPa, 2023 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11 [79%]37 hrs (195%) [88%] 12 [86%], 2014 1 [7%], 2022
Wet Hours 00 hrs (0%) [0%] 1, 2023 0, 2009
Cloud Cover am: Sunny
pm: Sunny transitioned to Mostly Cloudy
Events None
Comments -
Extra Comments
Issues 07-09 data spasms
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 3rd August 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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