Daily Report for 17th May 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.1 °C (-3.0) 05:23 7.8 °C (-0.4) 12.2 °C (+3.1), 2017 5.7 °C (-3.4), 2010
Maximum Temperature 17.1 °C (-0.8) 16:19 19.5 °C (+2.4) 25.9 °C (+8.0), 2022 11.6 °C (-6.3), 2013
Mean Temperature 11.3 °C (-1.9) 14.0 °C (+1.0) 19.4 °C, 2022 9.7 °C, 2013
Minimum Humidity 42% 15:40 43% 78%, 2017 37%, 2015
Maximum Humidity 87% 04:51 88% 96%, 2024 76%, 2015
Mean Humidity 66% 65% 87%, 2021 54%, 2015
Minimum Pressure 1027 hPa 15:16 1015 hPa 1028 hPa, 2023 998 hPa, 2021
Maximum Pressure 1029 hPa 00:20 1021 hPa 1030 hPa, 2023 1010 hPa, 2009
Mean Pressure 1028 hPa 1018 hPa 1029 hPa, 2023 1006 hPa, 2013
Mean Wind Speed 4.4 mph (-0.3) 4.1 mph (-0.6) 9.6 mph, 2009 1.2 mph, 2014
Maximum Wind Speed 12.0 mph 11:58 11.9 mph 14.1 mph, 2021 6.4 mph, 2014
Maximum Gust 19.6 mph 11:59 18.9 mph 33.0 mph, 2009 8.7 mph, 2014
Mean Wind Direction NNE
Rainfall 0.0 mm 14.1 mm (56%) 35.6 mm, 2017
Maximum Hourly Rain n/a 6.9, 2017
Maximum 10-min Rain n/a 2.4, 2021
Maximum Rain Rate n/a 32.8, 2009
Minimum Dew Point 3.8 °C 15:40 4.3 °C 10.1 °C, 2017 0.6 °C, 2012
Maximum Dew Point 6.4 °C 13:03 9.8 °C 16.2 °C, 2017 5.5 °C, 2012
Mean Dew Point 4.8 °C 6.8 °C 13.6 °C, 2017 3.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.1 °C 05:23 8.3 °C 16.0 °C, 2017 5.7 °C, 2010
Day Maximum (09-21) 17.1 °C 16:36 19.5 °C 25.9 °C, 2022 11.6 °C, 2013
Max 10m Temp Rise 0.7 °C 13:05 0.8 °C 5.6 °C, 2024 0.4 °C, 2019
Max 1hr Temp Rise 2.1 °C 07:43 2.9 °C 8.4 °C, 2024 1.2 °C, 2019
Max 1hr Hum Rise 8% 20:15 11% 22%, 2021 4%, 2017
Max 10m Temp Fall 0.4 °C 18:42 0.7 °C 2.5 °C, 2021 0.3 °C, 2019
Max 1hr Temp Fall 2.1 °C 20:21 2.2 °C 4.7 °C, 2021 0.9 °C, 2019
Max 1hr Hum Fall 10% 10:29 16% 31%, 2024 4%, 2017
Max 10m Wind Speed 8.7 mph 12:47 8.9 mph 11.3 mph, 2022 4.9 mph, 2014
Minimum Feels-like 2.5 °C 04:44 6.2 °C 13.5 °C, 2017 2.5 °C, 2018
Maximum Feels-like 17.1 °C 16:18 20.4 °C 30.1 °C, 2022 11.6 °C, 2013
Mean Feels-like 10.5 °C 14.0 °C 22.2 °C, 2022 9.4 °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 11.0 °C (+2.3) 11.7 °C (+2.8) 15.5 °C (+6.8), 2022 5.5 °C (-3.2), 2013
Humidity Range 45% 45% 53%, 2020 11%, 2017
Pressure Range 2 hPa 6 hPa 14 hPa, 2012 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13 [91%]147 hrs (145%) [62%] 13 [91%], 2018 0 [0%], 2017
Wet Hours 017 hrs (75%) [4%] 14, 2017 0, 2010
Cloud Cover am: Mostly Sunny transitioned to Sunny
pm: 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 17th 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