Daily Report for 15th June 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.6 °C (+0.6) 00:18 10.0 °C (-1.6) 14.9 °C (+2.9), 2011 8.6 °C (-3.4), 2010
Maximum Temperature 18.4 °C (-2.7) 16:36 16.8 °C (-3.6) 27.9 °C (+6.8), 2022 17.3 °C (-3.8), 2013
Mean Temperature 15.3 °C (-1.0) 13.3 °C (-2.6) 20.7 °C, 2023 13.0 °C, 2010
Minimum Humidity 49% 18:16 57% 64%, 2014 35%, 2022
Maximum Humidity 94% 05:35 93% 94%, 2012 77%, 2021
Mean Humidity 74% 77% 82%, 2024 56%, 2017
Minimum Pressure 1006 hPa 11:37 1005 hPa 1027 hPa, 2014 994 hPa, 2016
Maximum Pressure 1011 hPa 00:07 1013 hPa 1029 hPa, 2014 999 hPa, 2016
Mean Pressure 1009 hPa 1009 hPa 1028 hPa, 2014 996 hPa, 2016
Mean Wind Speed 7.5 mph (+3.1) 5.8 mph (+1.4) 8.0 mph, 2013 1.5 mph, 2022
Maximum Wind Speed 19.7 mph 14:37 14.2 mph 19.7 mph, 2012 8.4 mph, 2021
Maximum Gust 30.1 mph 13:33 20.4 mph 33.4 mph, 2013 11.5 mph, 2020
Mean Wind Direction SSW
Rainfall 4.7 mm 95.6 mm (407%) 5.3 mm, 2024
Maximum Hourly Rain 2.0 mm 01:43 2.0 mm, 2012
Maximum 10-min Rain 1.4 mm 01:44 1.4 mm, 2012
Maximum Rain Rate 30 mm/h 11:53 30 mm/h, 2012
Minimum Dew Point 6.3 °C 18:20 6.0 °C 10.8 °C, 2023 3.5 °C, 2010
Maximum Dew Point 12.9 °C 07:32 11.5 °C 16.1 °C, 2023 8.7 °C, 2010
Mean Dew Point 10.3 °C 9.0 °C 12.8 °C, 2023 6.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 12.5 °C * 23:00 10.2 °C 14.9 °C, 2011 8.6 °C, 2010
Day Maximum (09-21) 18.4 °C 16:37 16.8 °C 27.9 °C, 2022 17.3 °C, 2013
Max 10m Temp Rise 0.6 °C 10:01 0.6 °C 0.9 °C, 2009 0.5 °C, 2010
Max 1hr Temp Rise 2.2 °C 13:25 2.1 °C 3.9 °C, 2022 1.2 °C, 2014
Max 1hr Hum Rise 14% 12:32 10% 22%, 2013 5%, 2011
Max 10m Temp Fall 1.0 °C 12:05 0.5 °C 1.3 °C, 2024 0.4 °C, 2010
Max 1hr Temp Fall 1.5 °C 12:26 1.5 °C 3.6 °C, 2009 1.3 °C, 2010
Max 1hr Hum Fall 20% 13:34 12% 21%, 2024 7%, 2014
Max 10m Wind Speed 12.6 mph 16:13 9.6 mph 15.1 mph, 2024 6.0 mph, 2022
Minimum Feels-like 14.5 °C 00:00 10.1 °C 16.2 °C, 2011 7.0 °C, 2010
Maximum Feels-like 19.4 °C 10:28 17.8 °C 30.2 °C, 2022 17.8 °C, 2010
Mean Feels-like 16.7 °C 14.3 °C 23.4 °C, 2023 12.8 °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 5.8 °C (-3.2) 6.8 °C (-2.1) 17.3 °C (+8.3), 2022 4.7 °C (-4.3), 2014
Humidity Range 45% 36% 54%, 2022 18%, 2014
Pressure Range 5 hPa 8 hPa 8 hPa, 2015 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [26%]43 hrs (44%) [19%] 13 [86%], 2022 0 [0%], 2014
Wet Hours 2
[Mean rain rate: 2.4 mm/h]		88 hrs (473%) [24%] 5, 2024 0, 2010
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments 01-03, 12 Heavy; 15 Light 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 15th June 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