Daily Report for 9th May 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.6 °C (+2.4) 08:49 7.6 °C (-0.2) 14.2 °C (+6.0), 2016 5.9 °C (-2.3), 2022
Maximum Temperature 15.1 °C (-2.0) 12:35 12.7 °C (-4.0) 24.8 °C (+7.7), 2016 11.5 °C (-5.6), 2010
Mean Temperature 13.2 °C (+0.2) 10.1 °C (-2.1) 18.5 °C, 2016 8.4 °C, 2010
Minimum Humidity 72% 00:06 65% 72%, 2012 33%, 2016
Maximum Humidity 95% 23:59 93% 96%, 2019 74%, 2017
Mean Humidity 90% 83% 90%, 2012 56%, 2016
Minimum Pressure 1006 hPa 03:19 1009 hPa 1025 hPa, 2024 993 hPa, 2019
Maximum Pressure 1010 hPa 20:11 1015 hPa 1030 hPa, 2024 1002 hPa, 2021
Mean Pressure 1008 hPa 1012 hPa 1028 hPa, 2024 998 hPa, 2019
Mean Wind Speed 4.5 mph (-0.2) 4.3 mph (-0.4) 10.0 mph, 2013 2.4 mph, 2019
Maximum Wind Speed 12.3 mph 11.4 mph 24.6 mph, 2013 8.2 mph, 2024
Maximum Gust 18.7 mph 16:34 16.1 mph 38.4 mph, 2013 11.5 mph, 2024
Mean Wind Direction SSW
Rainfall 4.9 mm 27.1 mm (203%) 10.4 mm, 2023
Maximum Hourly Rain 1.5 mm 15:58 4.3 mm, 2023
Maximum 10-min Rain 0.9 mm 15:30 1.5 mm, 2023
Maximum Rain Rate 5.0 mm/h 15:31 14 mm/h, 2023
Minimum Dew Point 8.5 °C 00:10 4.8 °C 10.3 °C, 2023 1.1 °C, 2017
Maximum Dew Point 14.0 °C 11:40 9.4 °C 14.9 °C, 2024 4.3 °C, 2017
Mean Dew Point 11.6 °C 7.1 °C 12.2 °C, 2023 2.6 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.6 °C 08:48 7.8 °C 14.2 °C, 2016 5.9 °C, 2022
Day Maximum (09-21) 15.1 °C 12:35 12.7 °C 24.8 °C, 2016 11.5 °C, 2010
Max 10m Temp Rise 0.7 °C 11:35 0.5 °C 1.0 °C, 2020 0.5 °C, 2010
Max 1hr Temp Rise 2.8 °C 11:35 1.7 °C 4.8 °C, 2020 1.5 °C, 2023
Max 1hr Hum Rise 8% 01:07 8% 28%, 2013 5%, 2015
Max 10m Temp Fall 0.3 °C 00:37 0.3 °C 1.2 °C, 2013 0.3 °C, 2010
Max 1hr Temp Fall 1.1 °C 01:09 1.3 °C 3.3 °C, 2023 1.1 °C, 2012
Max 1hr Hum Fall 6% 12:05 9% 24%, 2013 6%, 2012
Max 10m Wind Speed 9.4 mph 16:39 7.7 mph 18.7 mph, 2013 5.8 mph, 2024
Minimum Feels-like 11.7 °C 08:40 6.5 °C 14.2 °C, 2016 3.1 °C, 2017
Maximum Feels-like 18.5 °C 11:42 13.7 °C 27.4 °C, 2024 11.5 °C, 2010
Mean Feels-like 15.4 °C 10.0 °C 20.1 °C, 2024 7.1 °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 4.5 °C (-4.4) 5.1 °C (-3.8) 15.9 °C (+7.0), 2022 4.5 °C (-4.4), 2012
Humidity Range 23% 27% 56%, 2020 23%, 2012
Pressure Range 4 hPa 6 hPa 14 hPa, 2017 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]8.1 hrs (15%) [6.6%] 12.5 [90%], 2011 0 [0%], 2012
Wet Hours 6
[Mean rain rate: 0.8 mm/h]		24 hrs (203%) [11%] 7, 2023 0, 2009
Cloud Cover Overcast
Events None
Comments 00-09, 13-18, 21- broken Light Showers/Rain/Drizzle
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 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

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Wind rose