Daily Report for 20th June 2023

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.8 °C (+4.5) 02:46 12.2 °C (+0.6) 17.6 °C (+5.3), 2017 7.3 °C (-5.0), 2010
Maximum Temperature 22.9 °C (+1.5) 13:39 24.1 °C (+3.6) 30.3 °C (+8.9), 2017 18.2 °C (-3.2), 2021
Mean Temperature 19.8 °C (+3.0) 18.0 °C (+2.1) 23.6 °C, 2017 12.4 °C, 2010
Minimum Humidity 66% 19:50 52% 80%, 2021 36%, 2012
Maximum Humidity 95% 08:47 87% 96%, 2021 75%, 2010
Mean Humidity 80% 70% 90%, 2021 58%, 2012
Minimum Pressure 1008 hPa 11:22 1017 hPa 1022 hPa, 2009 1008 hPa, 2023
Maximum Pressure 1013 hPa 23:51 1021 hPa 1025 hPa, 2024 1012 hPa, 2021
Mean Pressure 1010 hPa 1019 hPa 1023 hPa, 2009 1010 hPa, 2023
Mean Wind Speed 4.9 mph (+0.5) 5.2 mph (+0.8) 6.7 mph, 2018 1.8 mph, 2014
Maximum Wind Speed 15.1 mph 12:54 14.0 mph 15.1 mph, 2023 7.3 mph, 2010
Maximum Gust 23.0 mph 16:41 21.1 mph 23.0 mph, 2023 10.3 mph, 2010
Mean Wind Direction SW
Rainfall 5.3 mm 21.4 mm (68%) 15.2 mm, 2016
Maximum Hourly Rain 4.4 mm 07:47 5.5 mm, 2016
Maximum 10-min Rain 1.0 mm 07:36 1.5 mm, 2015
Maximum Rain Rate 7 mm/h 07:36 42 mm/h, 2015
Minimum Dew Point 13.7 °C 02:59 8.9 °C 13.7 °C, 2023 2.3 °C, 2010
Maximum Dew Point 18.4 °C 10:02 15.5 °C 18.4 °C, 2023 7.0 °C, 2010
Mean Dew Point 16.2 °C 12.1 °C 16.2 °C, 2023 5.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 16.8 °C 02:42 12.2 °C 17.6 °C, 2017 7.3 °C, 2010
Day Maximum (09-21) 22.9 °C 13:40 24.1 °C 30.3 °C, 2017 18.2 °C, 2021
Max 10m Temp Rise 0.6 °C 13:36 0.7 °C 1.5 °C, 2012 0.4 °C, 2015
Max 1hr Temp Rise 1.5 °C 09:16 2.5 °C 4.2 °C, 2012 1.4 °C, 2021
Max 1hr Hum Rise 8% 01:04 11% 20%, 2024 4%, 2021
Max 10m Temp Fall 0.5 °C 14:27 0.7 °C 0.7 °C, 2012 0.4 °C, 2010
Max 1hr Temp Fall 1.6 °C 01:15 2.2 °C 2.4 °C, 2017 1.2 °C, 2019
Max 1hr Hum Fall 11% 12:29 11% 17%, 2012 4%, 2015
Max 10m Wind Speed 11.2 mph 13:03 10.3 mph 11.2 mph, 2023 5.9 mph, 2017
Minimum Feels-like 20.0 °C 02:59 12.9 °C 20.6 °C, 2017 6.2 °C, 2010
Maximum Feels-like 28.8 °C 13:38 27.9 °C 34.6 °C, 2017 18.9 °C, 2010
Mean Feels-like 24.5 °C 20.5 °C 27.4 °C, 2017 12.0 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.1 °C (-2.9) 11.9 °C (+3.0) 13.8 °C (+4.8), 2024 5.8 °C (-3.2), 2021
Humidity Range 29% 35% 52%, 2012 16%, 2021
Pressure Range 5 hPa 3 hPa 8 hPa, 2016 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]186 hrs (145%) [62%] 14 [93%], 2022 0 [0%], 2021
Wet Hours 3
[Mean rain rate: 1.8 mm/h]
7 hrs (28%) [1.5%] 8, 2016 0, 2010
Cloud Cover unknown
Events Thunder
Comments thundery am
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 21.1 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 20th June 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