Daily Report for 14th May 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.9 °C (-2.0) 05:16 7.6 °C (-0.5) 14.1 °C (+5.2), 2024 3.0 °C (-5.9), 2020
Maximum Temperature 12.1 °C (-5.5) 17:22 13.8 °C (-3.3) 23.4 °C (+5.8), 2022 10.7 °C (-6.9), 2015
Mean Temperature 9.7 °C (-3.8) 10.8 °C (-1.9) 16.3 °C, 2022 8.5 °C, 2020
Minimum Humidity 58% 00:01 60% 72%, 2015 35%, 2018
Maximum Humidity 85% 14:53 90% 97%, 2015 75%, 2011
Mean Humidity 74% 77% 86%, 2015 55%, 2011
Minimum Pressure 1011 hPa 21:41 1012 hPa 1031 hPa, 2019 990 hPa, 2013
Maximum Pressure 1022 hPa 00:48 1020 hPa 1039 hPa, 2019 1005 hPa, 2024
Mean Pressure 1016 hPa 1016 hPa 1035 hPa, 2019 1003 hPa, 2013
Mean Wind Speed 6.4 mph (+1.7) 5.0 mph (+0.3) 6.4 mph, 2012 1.5 mph, 2022
Maximum Wind Speed 13.7 mph 12.7 mph 17.3 mph, 2013 7.1 mph, 2022
Maximum Gust 19.4 mph 17:46 18.5 mph 26.6 mph, 2013 10.3 mph, 2022
Mean Wind Direction WSW
Rainfall 1.4 mm 38.3 mm (184%) 14.4 mm, 2015
Maximum Hourly Rain 0.8 mm 13:47 3.0 mm, 2015
Maximum 10-min Rain 0.3 mm 12:51 1.0 mm, 2015
Maximum Rain Rate 0.9 mm/h 11:10 20 mm/h, 2017
Minimum Dew Point 1.6 °C 04:13 4.0 °C 11.3 °C, 2024 0.1 °C, 2020
Maximum Dew Point 8.8 °C 16:52 9.3 °C 13.5 °C, 2024 3.6 °C, 2020
Mean Dew Point 5.2 °C 6.5 °C 12.5 °C, 2024 1.9 °C, 2020
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.9 °C 05:15 8.0 °C 14.2 °C, 2024 3.0 °C, 2020
Day Maximum (09-21) 12.1 °C 17:22 13.7 °C 23.4 °C, 2022 10.7 °C, 2015
Max 10m Temp Rise 0.5 °C 07:13 0.6 °C 0.8 °C, 2020 0.3 °C, 2015
Max 1hr Temp Rise 1.3 °C 07:47 1.9 °C 3.2 °C, 2023 0.9 °C, 2015
Max 1hr Hum Rise 5% 01:01 8% 21%, 2017 4%, 2009
Max 10m Temp Fall 0.3 °C 22:21 0.4 °C 1.3 °C, 2017 0.3 °C, 2009
Max 1hr Temp Fall 1.1 °C 23:51 1.4 °C 3.7 °C, 2017 0.7 °C, 2021
Max 1hr Hum Fall 8% 17:47 10% 24%, 2018 7%, 2015
Max 10m Wind Speed 8.4 mph 16:48 8.3 mph 12.2 mph, 2013 4.5 mph, 2022
Minimum Feels-like 3.7 °C 05:29 6.4 °C 16.7 °C, 2024 -1.3 °C, 2020
Maximum Feels-like 12.8 °C 17:14 14.7 °C 25.4 °C, 2022 10.7 °C, 2015
Mean Feels-like 8.9 °C 10.9 °C 18.0 °C, 2024 7.2 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.2 °C (-3.6) 6.1 °C (-2.7) 14.2 °C (+5.4), 2022 2.7 °C (-6.1), 2015
Humidity Range 27% 31% 58%, 2014 21%, 2024
Pressure Range 11 hPa 8 hPa 20 hPa, 2013 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.5 [4%]38 hrs (45%) [19%] 14.1 [100%], 2019 0 [0%], 2015
Wet Hours 4
[Mean rain rate: 0.3 mm/h]		33 hrs (180%) [9.7%] 14, 2015 0, 2010
Cloud Cover Overcast with periods of Overcast
Events None
Comments 08-15 Slight broken Rain/Drizzle (12-14 Light)
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 14th 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