Daily Report for 9th April 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.4 °C (+2.7) 06:59 3.4 °C (-2.2) 9.1 °C (+3.4), 2020 2.1 °C (-3.6), 2022
Maximum Temperature 10.8 °C (-3.0) 14:44 12.0 °C (-1.6) 25.2 °C (+11.3), 2017 8.9 °C (-4.9), 2013
Mean Temperature 9.6 °C (-0.2) 8.1 °C (-1.9) 16.1 °C, 2017 5.8 °C, 2013
Minimum Humidity 75% 00:17 52% 93%, 2018 29%, 2017
Maximum Humidity 96% 23:46 88% 96%, 2012 71%, 2011
Mean Humidity 89% 70% 95%, 2018 55%, 2011
Minimum Pressure 987 hPa 23:26 1006 hPa 1032 hPa, 2010 987 hPa, 2012
Maximum Pressure 1007 hPa 00:41 1015 hPa 1035 hPa, 2010 1001 hPa, 2013
Mean Pressure 997 hPa 1011 hPa 1034 hPa, 2010 997 hPa, 2013
Mean Wind Speed 8.1 mph (+3.2) 4.2 mph (-0.7) 11.0 mph, 2024 2.0 mph, 2010
Maximum Wind Speed 17.6 mph 12.2 mph 20.9 mph, 2024 7.6 mph, 2010
Maximum Gust 27.5 mph 18:04 17.3 mph 35.7 mph, 2024 10.5 mph, 2010
Mean Wind Direction SW
Rainfall 8.0 mm 15.4 mm (122%) 8.0 mm, 2012
Maximum Hourly Rain 1.2 mm 07:32 1.3 mm, 2018
Maximum 10-min Rain 0.5 mm 23:02 0.5 mm, 2012
Maximum Rain Rate 6 mm/h 23:03 6 mm/h, 2012
Minimum Dew Point 5.5 °C 01:10 -0.9 °C 6.9 °C, 2018 -2.0 °C, 2022
Maximum Dew Point 9.6 °C 14:32 5.8 °C 11.1 °C, 2009 3.1 °C, 2022
Mean Dew Point 7.9 °C 2.7 °C 8.7 °C, 2009 0.8 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.4 °C 06:58 3.9 °C 9.1 °C, 2020 2.1 °C, 2022
Day Maximum (09-21) 10.8 °C 14:44 12.0 °C 25.2 °C, 2017 8.9 °C, 2013
Max 10m Temp Rise 0.2 °C 11:51 0.7 °C 0.9 °C, 2017 0.2 °C, 2012
Max 1hr Temp Rise 0.8 °C 12:25 2.7 °C 4.3 °C, 2017 0.4 °C, 2018
Max 1hr Hum Rise 4% 01:26 8% 26%, 2017 1%, 2018
Max 10m Temp Fall 0.2 °C 00:47 0.5 °C 1.1 °C, 2021 0.2 °C, 2012
Max 1hr Temp Fall 0.7 °C 01:28 1.8 °C 3.2 °C, 2017 0.6 °C, 2018
Max 1hr Hum Fall 2% 12:43 12% 19%, 2016 1%, 2018
Max 10m Wind Speed 14.5 mph 18:43 8.4 mph 17.5 mph, 2024 5.4 mph, 2010
Minimum Feels-like 5.1 °C 08:41 1.7 °C 8.1 °C, 2020 -2.0 °C, 2013
Maximum Feels-like 11.9 °C 14:30 12.0 °C 25.9 °C, 2017 8.3 °C, 2013
Mean Feels-like 8.7 °C 7.3 °C 16.4 °C, 2017 3.1 °C, 2013
Air-frost Hrs 0 hrs 0.6 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.4 °C (-5.7) 8.6 °C (+0.6) 18.8 °C (+10.7), 2017 1.6 °C (-6.5), 2018
Humidity Range 21% 36% 52%, 2022 3%, 2018
Pressure Range 20 hPa 9 hPa 26 hPa, 2024 3 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]35 hrs (75%) [32%] 12.1 [100%], 2017 0 [0%], 2012
Wet Hours 18
[Mean rain rate: 0.4 mm/h]		30 hrs (217%) [14%] 18, 2012 0, 2010
Cloud Cover Overcast
Events None
Comments 00-00 Light Rain (excl. 02-05,14-17)
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 9th April 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

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Webcam Summary of Cloud Conditions

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Wind rose