Daily Report for 7th May 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.4 °C (+6.6) 06:14 8.3 °C (+0.7) 14.4 °C (+6.6), 2011 3.9 °C (-3.9), 2012
Maximum Temperature 23.2 °C (+6.4) 14:59 18.7 °C (+2.1) 27.8 °C (+11.0), 2018 12.8 °C (-4.0), 2010
Mean Temperature 18.4 °C (+6.5) 13.5 °C (+1.4) 19.0 °C, 2018 8.6 °C, 2010
Minimum Humidity 46% 15:22 37% 70%, 2009 28%, 2018
Maximum Humidity 84% 10:50 74% 94%, 2024 76%, 2016
Mean Humidity 63% 55% 82%, 2022 52%, 2013
Minimum Pressure 1009 hPa 20:21 1014 hPa 1025 hPa, 2022 1005 hPa, 2016
Maximum Pressure 1013 hPa 01:35 1017 hPa 1030 hPa, 2022 1008 hPa, 2016
Mean Pressure 1011 hPa 1015 hPa 1027 hPa, 2022 1006 hPa, 2016
Mean Wind Speed 3.8 mph (-0.9) 6.2 mph (+1.5) 9.1 mph, 2009 2.5 mph, 2016
Maximum Wind Speed 14.3 mph 14.8 mph 20.0 mph, 2015 9.0 mph, 2023
Maximum Gust 19.7 mph 15:13 22.4 mph 34.0 mph, 2009 11.5 mph, 2023
Mean Wind Direction SE
Rainfall 1.1 mm 1.1 mm (11%) 2.0 mm, 2012
Maximum Hourly Rain n/a 07:46 1.2, 2012
Maximum 10-min Rain 0.5 mm 07:46 0.6 mm, 2012
Maximum Rain Rate 3.0 mm/h 07:46 4.2 mm/h, 2012
Minimum Dew Point 5.3 °C 00:25 0.3 °C 10.4 °C, 2023 -0.3 °C, 2021
Maximum Dew Point 15.1 °C 11:28 7.4 °C 15.1 °C, 2011 3.6 °C, 2010
Mean Dew Point 11.0 °C 4.0 °C 12.2 °C, 2023 1.6 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.4 °C 06:15 8.5 °C 14.4 °C, 2011 3.9 °C, 2012
Day Maximum (09-21) 23.2 °C 14:50 18.7 °C 27.8 °C, 2018 12.8 °C, 2010
Max 10m Temp Rise 0.7 °C 11:15 0.7 °C 1.0 °C, 2013 0.4 °C, 2009
Max 1hr Temp Rise 2.6 °C 11:32 2.9 °C 4.8 °C, 2018 1.2 °C, 2009
Max 1hr Hum Rise 15% 03:05 8% 15%, 2011 4%, 2020
Max 10m Temp Fall 0.3 °C 03:02 0.5 °C 0.8 °C, 2014 0.3 °C, 2010
Max 1hr Temp Fall 1.3 °C 03:29 1.6 °C 2.6 °C, 2018 0.9 °C, 2012
Max 1hr Hum Fall 8% 12:12 10% 24%, 2018 4%, 2009
Max 10m Wind Speed 8.7 mph 23:57 10.5 mph 17.6 mph, 2015 5.9 mph, 2023
Minimum Feels-like 15.7 °C 05:07 6.9 °C 15.7 °C, 2011 0.4 °C, 2021
Maximum Feels-like 25.7 °C 14:44 19.1 °C 29.6 °C, 2018 12.8 °C, 2010
Mean Feels-like 20.3 °C 13.4 °C 20.3 °C, 2011 7.4 °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 8.8 °C (-0.1) 10.4 °C (+1.4) 18.7 °C (+9.8), 2018 6.1 °C (-2.8), 2009
Humidity Range 38% 37% 60%, 2018 12%, 2009
Pressure Range 4 hPa 4 hPa 14 hPa, 2019 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [11%]66 hrs (161%) [69%] 13.8 [101%], 2018 0.7 [5%], 2009
Wet Hours 2
[Mean rain rate: 0.6 mm/h]		2 hrs (22%) [1.2%] 3, 2012 0, 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments 02-04, 07-09 Light Showers/Rain
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 7th May 2011.
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