Daily Report for 7th August 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.7 °C (-2.7) 05:55 13.9 °C (-0.6) 17.0 °C (+2.6), 2016 10.9 °C (-3.5), 2023
Maximum Temperature 20.0 °C (-3.0) 14:32 21.5 °C (-1.6) 35.1 °C (+12.1), 2020 19.0 °C (-4.0), 2009
Mean Temperature 15.7 °C (-2.9) 17.5 °C (-1.1) 25.1 °C, 2020 15.6 °C, 2011
Minimum Humidity 53% 15:05 49% 86%, 2009 26%, 2020
Maximum Humidity 89% 23:45 90% 98%, 2009 83%, 2011
Mean Humidity 74% 72% 95%, 2009 56%, 2020
Minimum Pressure 1015 hPa 00:45 1008 hPa 1025 hPa, 2022 996 hPa, 2021
Maximum Pressure 1022 hPa 21:51 1014 hPa 1029 hPa, 2022 1002 hPa, 2021
Mean Pressure 1019 hPa 1011 hPa 1027 hPa, 2022 999 hPa, 2021
Mean Wind Speed 5.0 mph (+1.0) 5.4 mph (+1.4) 11.9 mph, 2016 1.3 mph, 2015
Maximum Wind Speed 12.3 mph 11:00 14.7 mph 25.2 mph, 2016 6.4 mph, 2009
Maximum Gust 15.2 mph 14:57 19.7 mph 37.1 mph, 2016 8.7 mph, 2009
Mean Wind Direction WSW
Rainfall 0.8 mm 17.9 mm (147%) 9.8 mm, 2021
Maximum Hourly Rain 0.8 mm 21:59 4.8 mm, 2021
Maximum 10-min Rain 0.3 mm 21:27 2.7 mm, 2010
Maximum Rain Rate 1.0 mm/h 21:26 65 mm/h, 2010
Minimum Dew Point 8.8 °C 04:57 9.5 °C 13.6 °C, 2010 6.2 °C, 2013
Maximum Dew Point 13.4 °C 23:48 14.5 °C 18.1 °C, 2016 12.5 °C, 2011
Mean Dew Point 10.9 °C 12.0 °C 15.7 °C, 2009 9.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.7 °C 05:56 13.9 °C 18.0 °C, 2016 10.9 °C, 2023
Day Maximum (09-21) 20.0 °C 14:33 21.5 °C 35.1 °C, 2020 19.0 °C, 2009
Max 10m Temp Rise 0.5 °C 12:41 0.7 °C 1.1 °C, 2020 0.3 °C, 2009
Max 1hr Temp Rise 1.6 °C 11:13 2.3 °C 5.2 °C, 2020 1.0 °C, 2009
Max 1hr Hum Rise 8% 16:11 11% 27%, 2019 4%, 2009
Max 10m Temp Fall 0.4 °C 15:29 0.6 °C 2.0 °C, 2019 0.4 °C, 2009
Max 1hr Temp Fall 1.5 °C 15:53 1.9 °C 4.9 °C, 2019 1.3 °C, 2021
Max 1hr Hum Fall 11% 13:26 12% 20%, 2013 3%, 2009
Max 10m Wind Speed 8.3 mph 12:48 10.3 mph 19.2 mph, 2016 4.3 mph, 2009
Minimum Feels-like 12.5 °C 05:40 16.0 °C 19.9 °C, 2018 11.9 °C, 2015
Maximum Feels-like 21.6 °C 14:28 23.9 °C 38.8 °C, 2020 21.5 °C, 2011
Mean Feels-like 17.4 °C 19.8 °C 28.7 °C, 2020 17.1 °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 8.3 °C (-0.3) 7.6 °C (-1.1) 20.5 °C (+11.9), 2020 4.8 °C (-3.8), 2009
Humidity Range 36% 41% 67%, 2020 12%, 2009
Pressure Range 7 hPa 5 hPa 7 hPa, 2012 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.3 [2%]28 hrs (64%) [29%] 14 [102%], 2022 0.2 [1%], 2017
Wet Hours 1.5
[Mean rain rate: 0.5 mm/h]		4.4 hrs (51%) [2.6%] 7, 2021 0, 2013
Cloud Cover Mostly Cloudy with periods of Overcast
Events None
Comments 19 Slight Shower, 21-23 broken Light Rain/Drizzle
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 7th August 2012.
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

daycamsum

Wind rose