Daily Report for 18th June 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.8 °C (+2.6) 05:34 12.5 °C (+1.0) 18.8 °C (+6.6), 2017 10.9 °C (-1.3), 2010
Maximum Temperature 25.4 °C (+4.2) 15:59 22.0 °C (+1.6) 31.8 °C (+10.6), 2017 16.2 °C (-5.0), 2021
Mean Temperature 19.4 °C (+3.4) 17.0 °C (+1.3) 25.9 °C, 2017 13.9 °C, 2010
Minimum Humidity 46% 14:26 53% 92%, 2021 39%, 2017
Maximum Humidity 93% 03:30 89% 96%, 2021 74%, 2017
Mean Humidity 71% 73% 94%, 2021 54%, 2017
Minimum Pressure 1017 hPa 00:06 1015 hPa 1024 hPa, 2014 996 hPa, 2011
Maximum Pressure 1021 hPa 22:47 1019 hPa 1027 hPa, 2014 1005 hPa, 2011
Mean Pressure 1019 hPa 1017 hPa 1026 hPa, 2014 1000 hPa, 2011
Mean Wind Speed 7.8 mph (+3.4) 4.3 mph (-0.1) 7.8 mph, 2018 1.1 mph, 2017
Maximum Wind Speed 15.3 mph 21:12 11.4 mph 16.6 mph, 2011 5.7 mph, 2017
Maximum Gust 25.3 mph 17:04 17.4 mph 26.2 mph, 2022 8.4 mph, 2017
Mean Wind Direction WSW
Rainfall 0.0 mm 0.8 mm (3%) 20.7 mm, 2020
Maximum Hourly Rain n/a 6, 2021
Maximum 10-min Rain n/a 2.5, 2020
Maximum Rain Rate n/a 30, 2012
Minimum Dew Point 11.8 °C 14:01 9.4 °C 13.8 °C, 2017 4.7 °C, 2015
Maximum Dew Point 15.5 °C 18:42 14.1 °C 19.6 °C, 2023 11.2 °C, 2012
Mean Dew Point 13.7 °C 11.8 °C 16.4 °C, 2023 8.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.8 °C 05:33 12.7 °C 18.8 °C, 2017 10.9 °C, 2010
Day Maximum (09-21) 25.4 °C 15:59 22.0 °C 31.8 °C, 2017 14.4 °C, 2021
Max 10m Temp Rise 0.6 °C 12:36 0.7 °C 0.8 °C, 2013 0.3 °C, 2021
Max 1hr Temp Rise 1.9 °C 12:39 2.5 °C 2.9 °C, 2023 0.4 °C, 2021
Max 1hr Hum Rise 7% 21:51 9% 17%, 2011 2%, 2021
Max 10m Temp Fall 0.5 °C 16:09 0.5 °C 1.1 °C, 2022 0.3 °C, 2009
Max 1hr Temp Fall 1.5 °C 19:25 1.8 °C 2.6 °C, 2022 0.8 °C, 2021
Max 1hr Hum Fall 9% 06:43 12% 16%, 2009 2%, 2021
Max 10m Wind Speed 12.1 mph 17:57 8.6 mph 12.8 mph, 2011 3.7 mph, 2017
Minimum Feels-like 17.3 °C 05:39 13.6 °C 22.1 °C, 2017 10.9 °C, 2010
Maximum Feels-like 29.1 °C 15:58 24.9 °C 36.7 °C, 2017 18.2 °C, 2016
Mean Feels-like 22.7 °C 19.2 °C 30.3 °C, 2017 15.1 °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 10.6 °C (+1.6) 9.5 °C (+0.6) 13.0 °C (+4.0), 2017 4.1 °C (-4.9), 2016
Humidity Range 47% 36% 47%, 2018 4%, 2021
Pressure Range 4 hPa 3 hPa 11 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [60%]99 hrs (85%) [37%] 11 [73%], 2017 0 [0%], 2021
Wet Hours 03.5 hrs (16%) [0.8%] 13, 2020 0, 2009
Cloud Cover am: Partly Cloudy
pm: Sunny transitioned to Mostly Sunny
Events None
Comments -
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 18th June 2018.
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