Daily Report for 23rd June 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 18.2 °C (+5.6) 23:59 13.1 °C (+1.2) 18.2 °C (+5.6), 2016 7.7 °C (-4.9), 2021
Maximum Temperature 21.5 °C (-0.2) 11:33 20.1 °C (-0.7) 28.5 °C (+6.8), 2020 17.2 °C (-4.5), 2013
Mean Temperature 19.6 °C (+2.7) 16.3 °C (+0.3) 21.8 °C, 2023 14.9 °C, 2013
Minimum Humidity 85% 07:57 62% 85%, 2016 24%, 2018
Maximum Humidity 91% 16:59 88% 92%, 2019 69%, 2010
Mean Humidity 88% 77% 88%, 2016 50%, 2010
Minimum Pressure 1015 hPa 12:42 1011 hPa 1027 hPa, 2018 1005 hPa, 2013
Maximum Pressure 1019 hPa 00:35 1016 hPa 1031 hPa, 2018 1014 hPa, 2022
Mean Pressure 1017 hPa 1014 hPa 1029 hPa, 2018 1009 hPa, 2013
Mean Wind Speed 1.3 mph (-3.1) 3.3 mph (-1.1) 7.9 mph, 2013 0.7 mph, 2014
Maximum Wind Speed 8.9 mph 15:11 10.2 mph 17.0 mph, 2013 7.4 mph, 2014
Maximum Gust 14.5 mph 15:11 15.5 mph 25.9 mph, 2013 10.2 mph, 2014
Mean Wind Direction WSW
Rainfall 30.4 mm 82.1 mm (228%) 30.4 mm, 2016
Maximum Hourly Rain 11.5 mm 03:43 11.5 mm, 2016
Maximum 10-min Rain 4.1 mm 02:54 4.1 mm, 2016
Maximum Rain Rate 102 mm/h 02:45 102 mm/h, 2016
Minimum Dew Point 15.1 °C 11:33 9.4 °C 15.1 °C, 2016 0.6 °C, 2018
Maximum Dew Point 19.2 °C 16:39 14.4 °C 19.2 °C, 2016 8.4 °C, 2015
Mean Dew Point 17.5 °C 12.0 °C 17.5 °C, 2016 7.3 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 18.5 °C * 04:47 13.2 °C 18.5 °C, 2016 7.7 °C, 2021
Day Maximum (09-21) 21.5 °C 11:33 20.1 °C 28.5 °C, 2020 17.2 °C, 2013
Max 10m Temp Rise 1.5 °C 11:33 0.5 °C 1.5 °C, 2016 0.5 °C, 2010
Max 1hr Temp Rise 1.5 °C 11:33 1.8 °C 3.8 °C, 2022 1.4 °C, 2013
Max 1hr Hum Rise 8% 16:53 8% 17%, 2013 6%, 2010
Max 10m Temp Fall 0.6 °C 11:48 0.6 °C 0.7 °C, 2012 0.3 °C, 2017
Max 1hr Temp Fall 1.3 °C 17:02 1.7 °C 2.7 °C, 2021 1.1 °C, 2019
Max 1hr Hum Fall 6% 17:49 9% 22%, 2022 6%, 2016
Max 10m Wind Speed 6.8 mph 15:13 7.6 mph 12.8 mph, 2013 4.5 mph, 2014
Minimum Feels-like 22.9 °C 23:59 14.3 °C 22.9 °C, 2016 7.7 °C, 2021
Maximum Feels-like 28.1 °C 11:38 23.1 °C 32.5 °C, 2020 18.0 °C, 2013
Mean Feels-like 25.3 °C 18.6 °C 25.7 °C, 2023 15.5 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.3 °C (-5.7) 7.0 °C (-1.9) 15.9 °C (+6.9), 2020 3.3 °C (-5.7), 2016
Humidity Range 6% 26% 60%, 2018 6%, 2016
Pressure Range 4 hPa 5 hPa 11 hPa, 2013 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]70 hrs (47%) [20%] 15.1 [100%], 2020 0.1 [1%], 2016
Wet Hours 12
[Mean rain rate: 2.5 mm/h]		43 hrs (153%) [7.9%] 12, 2016 0, 2009
Cloud Cover Overcast or Mostly Cloudy
Events Moderate Thunderstorm
Comments o.night, pm Thunderstorms with Heavy Rain
Extra Comments Nearby areas had 50+ mm (e.g. casa, 52mm)
Issues 08-17 data loss (casa substitution)
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 23rd June 2016.
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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose