Daily Report for 17th June 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.3 °C (+1.2) 05:28 10.2 °C (-1.4) 16.4 °C (+4.3), 2022 8.3 °C (-3.8), 2010
Maximum Temperature 24.4 °C (+3.3) 16:08 20.0 °C (-0.4) 31.9 °C (+10.8), 2022 14.8 °C (-6.3), 2011
Mean Temperature 18.9 °C (+2.2) 15.3 °C (-0.9) 25.1 °C, 2022 12.5 °C, 2011
Minimum Humidity 52% 01:16 43% 76%, 2021 35%, 2010
Maximum Humidity 77% 23:54 81% 95%, 2011 77%, 2015
Mean Humidity 64% 62% 88%, 2021 54%, 2022
Minimum Pressure 1020 hPa 19:34 1016 hPa 1026 hPa, 2014 995 hPa, 2011
Maximum Pressure 1026 hPa 01:53 1024 hPa 1028 hPa, 2014 1011 hPa, 2011
Mean Pressure 1023 hPa 1020 hPa 1027 hPa, 2014 1003 hPa, 2011
Mean Wind Speed 7.1 mph (+2.7) 5.4 mph (+1.0) 7.1 mph, 2015 1.3 mph, 2020
Maximum Wind Speed 16.8 mph 15:28 13.9 mph 17.0 mph, 2019 7.6 mph, 2021
Maximum Gust 26.6 mph 15:27 20.3 mph 26.6 mph, 2015 11.5 mph, 2017
Mean Wind Direction WSW
Rainfall 0.0 mm 0.5 mm (2%) 7.6 mm, 2011
Maximum Hourly Rain n/a 5.5, 2016
Maximum 10-min Rain n/a 3.1, 2016
Maximum Rain Rate n/a 54, 2016
Minimum Dew Point 5.9 °C 02:45 4.3 °C 15.0 °C, 2021 3.8 °C, 2014
Maximum Dew Point 15.3 °C 15:04 10.5 °C 18.5 °C, 2021 9.6 °C, 2014
Mean Dew Point 11.8 °C 7.5 °C 16.9 °C, 2021 8.0 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.3 °C 05:28 10.4 °C 18.0 °C, 2021 8.3 °C, 2010
Day Maximum (09-21) 24.4 °C 16:08 20.0 °C 31.9 °C, 2022 14.8 °C, 2011
Max 10m Temp Rise 0.8 °C 10:26 0.7 °C 0.9 °C, 2022 0.3 °C, 2011
Max 1hr Temp Rise 2.6 °C 10:32 2.4 °C 3.8 °C, 2022 1.2 °C, 2011
Max 1hr Hum Rise 8% 05:08 10% 23%, 2024 7%, 2011
Max 10m Temp Fall 0.6 °C 17:30 0.5 °C 0.8 °C, 2016 0.3 °C, 2013
Max 1hr Temp Fall 1.3 °C 18:17 1.8 °C 2.4 °C, 2017 1.1 °C, 2013
Max 1hr Hum Fall 7% 10:57 11% 23%, 2022 7%, 2009
Max 10m Wind Speed 12.4 mph 17:45 10.1 mph 14.0 mph, 2022 5.5 mph, 2020
Minimum Feels-like 13.6 °C 04:54 9.5 °C 20.1 °C, 2021 6.9 °C, 2010
Maximum Feels-like 28.4 °C 16:05 21.2 °C 37.5 °C, 2022 16.2 °C, 2011
Mean Feels-like 21.2 °C 16.0 °C 29.0 °C, 2022 13.8 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.1 °C (+2.1) 9.8 °C (+0.9) 15.5 °C (+6.5), 2022 4.9 °C (-4.1), 2011
Humidity Range 25% 38% 50%, 2010 18%, 2021
Pressure Range 6 hPa 7 hPa 16 hPa, 2011 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]101 hrs (92%) [40%] 13 [86%], 2010 0.1 [1%], 2021
Wet Hours 03.7 hrs (18%) [0.9%] 7, 2011 0, 2010
Cloud Cover Partly Cloudy with periods of Mostly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th June 2015.
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