Daily Report for 23rd July 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.1 °C (-3.6) 04:19 15.5 °C (+1.4) 19.4 °C (+4.7), 2013 10.9 °C (-3.8), 2011
Maximum Temperature 20.0 °C (-3.3) 16:35 24.2 °C (+1.2) 32.6 °C (+9.3), 2019 18.0 °C (-5.3), 2011
Mean Temperature 15.5 °C (-3.5) 19.7 °C (+1.3) 25.1 °C, 2018 14.9 °C, 2011
Minimum Humidity 57% 15:09 46% 65%, 2023 28%, 2012
Maximum Humidity 87% 07:23 79% 96%, 2019 73%, 2012
Mean Humidity 75% 62% 82%, 2023 49%, 2012
Minimum Pressure 1010 hPa 02:51 1012 hPa 1019 hPa, 2012 1001 hPa, 2009
Maximum Pressure 1013 hPa 15:47 1018 hPa 1025 hPa, 2012 1006 hPa, 2023
Mean Pressure 1012 hPa 1016 hPa 1023 hPa, 2012 1004 hPa, 2023
Mean Wind Speed 2.2 mph (-2.1) 3.7 mph (-0.6) 8.0 mph, 2023 2.2 mph, 2017
Maximum Wind Speed 10.2 mph 12:35 11.4 mph 16.5 mph, 2023 8.0 mph, 2010
Maximum Gust 18.9 mph 12:35 17.4 mph 26.5 mph, 2023 11.4 mph, 2010
Mean Wind Direction WNW
Rainfall 0.2 mm 58.8 mm (172%) 12.2 mm, 2013
Maximum Hourly Rain 0.2 mm 4.6 mm, 2013
Maximum 10-min Rain 0.2 mm 2.7 mm, 2013
Maximum Rain Rate n/a 60, 2013
Minimum Dew Point 8.5 °C 04:09 9.1 °C 14.6 °C, 2019 3.5 °C, 2011
Maximum Dew Point 13.4 °C 11:27 14.5 °C 20.8 °C, 2013 10.7 °C, 2015
Mean Dew Point 10.9 °C 11.8 °C 17.1 °C, 2013 7.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.1 °C 04:19 15.6 °C 19.4 °C, 2013 10.9 °C, 2011
Day Maximum (09-21) 20.0 °C 16:35 24.2 °C 32.6 °C, 2019 18.0 °C, 2011
Max 10m Temp Rise 0.7 °C 11:25 0.6 °C 0.9 °C, 2009 0.5 °C, 2022
Max 1hr Temp Rise 2.4 °C 11:25 2.2 °C 3.9 °C, 2016 1.8 °C, 2021
Max 1hr Hum Rise 7% 17:50 8% 16%, 2018 6%, 2015
Max 10m Temp Fall 0.4 °C 17:27 0.5 °C 1.4 °C, 2009 0.4 °C, 2014
Max 1hr Temp Fall 1.5 °C 17:47 1.9 °C 2.7 °C, 2009 1.3 °C, 2015
Max 1hr Hum Fall 11% 11:43 10% 15%, 2013 8%, 2018
Max 10m Wind Speed 7.9 mph 12:41 8.4 mph 12.7 mph, 2023 4.0 mph, 2009
Minimum Feels-like 11.7 °C 04:04 17.0 °C 23.2 °C, 2013 11.7 °C, 2011
Maximum Feels-like 22.0 °C 16:34 26.9 °C 38.1 °C, 2019 18.1 °C, 2011
Mean Feels-like 17.3 °C 22.0 °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 8.9 °C (+0.3) 8.8 °C (-0.1) 16.7 °C (+8.2), 2019 7.1 °C (-1.5), 2011
Humidity Range 30% 33% 61%, 2019 27%, 2021
Pressure Range 3 hPa 6 hPa 9 hPa, 2021 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [21%]138 hrs (94%) [40%] 14.5 [100%], 2019 1 [7%], 2010
Wet Hours 0.528 hrs (109%) [5%] 4, 2013 0, 2010
Cloud Cover am: Overcast transitioned to Partly Cloudy
pm: Partly Cloudy
Events None
Comments eve Showers
Extra Comments
Issues Rn data from casa
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 2017.
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

daycamsumLarge resolution version

Wind rose