Daily Report for 19th July 2023

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.7 °C (+1.2) 06:56 14.1 °C (+0.1) 21.1 °C (+6.6), 2022 11.9 °C (-2.6), 2011
Maximum Temperature 22.9 °C (-0.4) 15:52 22.4 °C (-0.5) 39.1 °C (+15.8), 2022 18.6 °C (-4.7), 2019
Mean Temperature 18.6 °C (+0.4) 18.3 °C (-0.2) 30.1 °C, 2022 15.3 °C, 2011
Minimum Humidity 57% 16:38 55% 68%, 2017 20%, 2022
Maximum Humidity 92% 07:19 90% 94%, 2011 66%, 2010
Mean Humidity 74% 73% 84%, 2011 44%, 2022
Minimum Pressure 1015 hPa 05:10 1011 hPa 1023 hPa, 2013 1000 hPa, 2011
Maximum Pressure 1018 hPa 23:52 1017 hPa 1027 hPa, 2013 1008 hPa, 2011
Mean Pressure 1016 hPa 1014 hPa 1025 hPa, 2013 1004 hPa, 2011
Mean Wind Speed 4.1 mph (-0.2) 6.3 mph (+2.0) 6.1 mph, 2009 1.1 mph, 2021
Maximum Wind Speed 11.1 mph 14:41 15.6 mph 19.0 mph, 2022 7.6 mph, 2021
Maximum Gust 16.1 mph 12:29 24.4 mph 27.4 mph, 2022 12.5 mph, 2011
Mean Wind Direction NW
Rainfall 0.7 mm 32.6 mm (116%) 5.9 mm, 2019
Maximum Hourly Rain 0.7 mm 07:00 4.5 mm, 2017
Maximum 10-min Rain 0.3 mm 06:33 1.5 mm, 2014
Maximum Rain Rate 1.2 mm/h 06:33 24 mm/h, 2014
Minimum Dew Point 11.9 °C 00:41 11.0 °C 14.8 °C, 2021 -0.3 °C, 2015
Maximum Dew Point 15.8 °C 11:27 15.2 °C 21.5 °C, 2021 11.9 °C, 2010
Mean Dew Point 13.8 °C 13.1 °C 18.3 °C, 2021 7.1 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.7 °C 07:02 14.3 °C 21.1 °C, 2022 11.9 °C, 2011
Day Maximum (09-21) 22.9 °C 15:49 22.4 °C 39.1 °C, 2022 18.6 °C, 2019
Max 10m Temp Rise 0.7 °C 13:56 0.7 °C 0.9 °C, 2012 0.4 °C, 2019
Max 1hr Temp Rise 1.7 °C 13:56 2.1 °C 4.3 °C, 2022 1.6 °C, 2019
Max 1hr Hum Rise 13% 22:07 11% 27%, 2022 4%, 2010
Max 10m Temp Fall 0.5 °C 14:31 0.6 °C 1.4 °C, 2022 0.4 °C, 2013
Max 1hr Temp Fall 2.4 °C 21:52 1.9 °C 5.5 °C, 2022 1.4 °C, 2017
Max 1hr Hum Fall 10% 12:26 11% 21%, 2018 6%, 2017
Max 10m Wind Speed 8.2 mph 12:29 11.8 mph 13.6 mph, 2022 5.2 mph, 2020
Minimum Feels-like 18.3 °C 01:38 16.3 °C 24.3 °C, 2022 13.6 °C, 2011
Maximum Feels-like 26.9 °C 15:53 25.8 °C 42.6 °C, 2022 21.9 °C, 2012
Mean Feels-like 21.9 °C 21.2 °C 34.1 °C, 2022 17.9 °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 7.2 °C (-1.5) 8.3 °C (-0.6) 18.0 °C (+9.3), 2022 4.5 °C (-4.2), 2017
Humidity Range 35% 35% 54%, 2015 17%, 2017
Pressure Range 2 hPa 6 hPa 9 hPa, 2016 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [27%]96 hrs (79%) [34%] 14.6 [100%], 2016 0.3 [2%], 2019
Wet Hours 2
[Mean rain rate: 0.3 mm/h]
34 hrs (163%) [7.5%] 4, 2019 0, 2010
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 20.6 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th July 2023.
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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose