Daily Report for 10th May 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.2 °C (+5.8) 23:57 8.3 °C (+0.4) 14.8 °C (+6.5), 2016 4.9 °C (-3.4), 2019
Maximum Temperature 17.1 °C (-0.1) 13:45 13.2 °C (-3.6) 23.6 °C (+6.4), 2024 12.8 °C (-4.4), 2010
Mean Temperature 15.5 °C (+2.9) 10.6 °C (-1.6) 17.7 °C, 2024 8.6 °C, 2010
Minimum Humidity 83% 13:12 67% 83%, 2012 33%, 2011
Maximum Humidity 97% 01:41 93% 97%, 2012 78%, 2017
Mean Humidity 92% 84% 92%, 2012 55%, 2011
Minimum Pressure 1006 hPa 04:03 1009 hPa 1024 hPa, 2024 997 hPa, 2021
Maximum Pressure 1013 hPa 23:41 1015 hPa 1026 hPa, 2024 1008 hPa, 2021
Mean Pressure 1010 hPa 1012 hPa 1025 hPa, 2024 1002 hPa, 2021
Mean Wind Speed 8.6 mph (+3.9) 4.8 mph (+0.0) 9.0 mph, 2014 2.1 mph, 2017
Maximum Wind Speed 17.0 mph 11.9 mph 22.5 mph, 2021 8.2 mph, 2017
Maximum Gust 26.6 mph 02:13 17.2 mph 36.9 mph, 2020 11.5 mph, 2017
Mean Wind Direction SW
Rainfall 9.8 mm 36.9 mm (249%) 9.8 mm, 2012
Maximum Hourly Rain 4.9 mm 16:07 4.9 mm, 2012
Maximum 10-min Rain 2.6 mm 15:47 2.6 mm, 2012
Maximum Rain Rate 20 mm/h 15:48 24 mm/h, 2014
Minimum Dew Point 12.6 °C 23:57 5.6 °C 12.6 °C, 2012 -0.6 °C, 2010
Maximum Dew Point 14.9 °C 16:47 9.9 °C 15.1 °C, 2024 4.1 °C, 2010
Mean Dew Point 14.1 °C 7.8 °C 14.1 °C, 2012 2.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.2 °C 06:30 8.5 °C 14.8 °C, 2016 4.9 °C, 2019
Day Maximum (09-21) 17.1 °C 13:45 13.2 °C 23.6 °C, 2024 12.8 °C, 2010
Max 10m Temp Rise 0.2 °C 11:26 0.5 °C 1.0 °C, 2011 0.2 °C, 2012
Max 1hr Temp Rise 0.7 °C 09:48 1.6 °C 5.0 °C, 2011 0.6 °C, 2016
Max 1hr Hum Rise 7% 15:37 8% 26%, 2014 4%, 2016
Max 10m Temp Fall 0.3 °C 14:51 0.3 °C 0.9 °C, 2014 0.2 °C, 2016
Max 1hr Temp Fall 1.0 °C 15:29 1.3 °C 2.9 °C, 2014 0.6 °C, 2016
Max 1hr Hum Fall 6% 10:57 9% 29%, 2014 1%, 2016
Max 10m Wind Speed 11.2 mph 12:03 8.0 mph 17.9 mph, 2021 5.9 mph, 2017
Minimum Feels-like 16.8 °C 23:56 7.5 °C 17.6 °C, 2016 1.0 °C, 2020
Maximum Feels-like 20.6 °C 13:40 14.4 °C 27.3 °C, 2024 12.8 °C, 2010
Mean Feels-like 18.9 °C 10.9 °C 20.0 °C, 2024 7.3 °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 2.9 °C (-5.9) 4.9 °C (-4.0) 14.5 °C (+5.7), 2009 1.9 °C (-7.0), 2016
Humidity Range 14% 26% 53%, 2018 13%, 2016
Pressure Range 7 hPa 6 hPa 14 hPa, 2014 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]8.1 hrs (14%) [5.9%] 14 [101%], 2024 0 [0%], 2012
Wet Hours 5
[Mean rain rate: 2.0 mm/h]		29 hrs (222%) [12%] 9, 2016 0, 2009
Cloud Cover Overcast
Events None
Comments 00-06 Light/Moderate Showers, 15-16 Heavy Showers
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 10th May 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.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose