Daily Report for 23rd May 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.3 °C (+0.4) 05:44 7.8 °C (-0.8) 12.8 °C (+2.9), 2012 5.4 °C (-4.5), 2021
Maximum Temperature 18.4 °C (-0.1) 15:58 19.8 °C (+2.3) 29.1 °C (+10.6), 2010 11.0 °C (-7.5), 2013
Mean Temperature 13.3 °C (+0.2) 14.1 °C (+0.8) 19.4 °C, 2010 8.1 °C, 2013
Minimum Humidity 64% 15:00 44% 64%, 2018 33%, 2009
Maximum Humidity 86% 06:20 88% 94%, 2024 71%, 2014
Mean Humidity 79% 66% 79%, 2024 51%, 2019
Minimum Pressure 1022 hPa 00:06 1016 hPa 1026 hPa, 2023 1001 hPa, 2022
Maximum Pressure 1025 hPa 11:27 1022 hPa 1029 hPa, 2023 1008 hPa, 2014
Mean Pressure 1024 hPa 1019 hPa 1028 hPa, 2023 1004 hPa, 2022
Mean Wind Speed 4.5 mph (-0.2) 3.9 mph (-0.8) 10.8 mph, 2020 2.4 mph, 2010
Maximum Wind Speed 12.1 mph 12:05 11.7 mph 23.3 mph, 2020 6.4 mph, 2012
Maximum Gust 19.6 mph 13:15 18.5 mph 39.2 mph, 2020 8.7 mph, 2012
Mean Wind Direction NNE
Rainfall 0.0 mm 14.1 mm (41%) 4.6 mm, 2021
Maximum Hourly Rain n/a 2, 2015
Maximum 10-min Rain n/a 1, 2021
Maximum Rain Rate n/a 14.4, 2021
Minimum Dew Point 7.8 °C 04:21 4.7 °C 10.3 °C, 2012 -2.2 °C, 2013
Maximum Dew Point 12.4 °C 15:57 10.2 °C 16.8 °C, 2012 2.8 °C, 2013
Mean Dew Point 9.6 °C 7.3 °C 13.7 °C, 2012 0.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.3 °C 05:39 8.2 °C 13.0 °C, 2015 5.4 °C, 2021
Day Maximum (09-21) 18.4 °C 15:59 19.8 °C 29.1 °C, 2010 11.0 °C, 2013
Max 10m Temp Rise 0.8 °C 11:45 0.8 °C 1.0 °C, 2013 0.5 °C, 2010
Max 1hr Temp Rise 1.8 °C 09:59 2.9 °C 2.9 °C, 2012 1.7 °C, 2014
Max 1hr Hum Rise 6% 17:00 11% 21%, 2013 6%, 2018
Max 10m Temp Fall 0.4 °C 16:25 0.6 °C 1.6 °C, 2020 0.4 °C, 2012
Max 1hr Temp Fall 1.5 °C 16:57 2.1 °C 3.9 °C, 2022 1.3 °C, 2021
Max 1hr Hum Fall 7% 14:38 15% 22%, 2009 6%, 2017
Max 10m Wind Speed 8.6 mph 12:08 8.6 mph 16.7 mph, 2021 5.0 mph, 2012
Minimum Feels-like 10.7 °C 04:39 6.6 °C 14.2 °C, 2012 2.2 °C, 2013
Maximum Feels-like 20.9 °C 15:57 20.8 °C 31.2 °C, 2010 11.0 °C, 2013
Mean Feels-like 14.4 °C 14.3 °C 22.2 °C, 2012 6.5 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.1 °C (-0.5) 11.9 °C (+3.1) 18.5 °C (+9.9), 2010 4.9 °C (-3.7), 2014
Humidity Range 22% 45% 59%, 2010 19%, 2017
Pressure Range 3 hPa 5 hPa 11 hPa, 2016 1 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [35%]214 hrs (155%) [67%] 14.6 [101%], 2010 1 [7%], 2022
Wet Hours 017 hrs (56%) [3%] 5, 2021 0, 2009
Cloud Cover am: Overcast transitioned to Sunny
pm: Mostly Cloudy
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 23rd May 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