Daily Report for 20th October 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (-2.9) 07:20 10.2 °C (+1.1) 13.1 °C (+4.8), 2014 -0.4 °C (-8.7), 2010
Maximum Temperature 16.6 °C (+2.3) 16:29 17.8 °C (+2.4) 17.7 °C (+3.4), 2021 7.9 °C (-6.4), 2010
Mean Temperature 11.0 °C (-0.3) 13.7 °C (+1.7) 15.3 °C, 2021 4.6 °C, 2010
Minimum Humidity 67% 16:39 68% 88%, 2022 46%, 2010
Maximum Humidity 98% 09:19 92% 98%, 2012 83%, 2016
Mean Humidity 85% 82% 93%, 2023 70%, 2011
Minimum Pressure 1030 hPa 03:00 1016 hPa 1030 hPa, 2018 975 hPa, 2023
Maximum Pressure 1033 hPa 11:36 1021 hPa 1033 hPa, 2018 981 hPa, 2023
Mean Pressure 1031 hPa 1018 hPa 1031 hPa, 2018 978 hPa, 2023
Mean Wind Speed 1.3 mph (-2.8) 4.2 mph (+0.1) 8.1 mph, 2017 1.3 mph, 2018
Maximum Wind Speed 8.1 mph 15:11 12.5 mph 20.9 mph, 2021 6.0 mph, 2015
Maximum Gust 11.5 mph 12:25 20.0 mph 33.1 mph, 2021 8.7 mph, 2012
Mean Wind Direction WSW
Rainfall 0.0 mm 33.1 mm (79%) 25.2 mm, 2021
Maximum Hourly Rain n/a 8.5, 2013
Maximum 10-min Rain n/a 4.7, 2013
Maximum Rain Rate n/a 108, 2013
Minimum Dew Point 4.7 °C 07:18 8.0 °C 11.9 °C, 2023 -4.4 °C, 2010
Maximum Dew Point 11.0 °C 15:48 12.7 °C 16.3 °C, 2024 3.4 °C, 2010
Mean Dew Point 8.4 °C 10.5 °C 13.4 °C, 2023 -0.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.4 °C 07:21 10.6 °C 15.6 °C, 2021 2.7 °C, 2010
Day Maximum (09-21) 16.6 °C 16:29 17.4 °C 17.7 °C, 2021 7.9 °C, 2010
Max 10m Temp Rise 0.8 °C 10:30 0.5 °C 0.8 °C, 2018 0.3 °C, 2012
Max 1hr Temp Rise 3.7 °C 11:00 1.9 °C 3.7 °C, 2018 0.8 °C, 2022
Max 1hr Hum Rise 8% 18:39 7% 10%, 2010 3%, 2019
Max 10m Temp Fall 0.4 °C 18:16 0.4 °C 1.1 °C, 2013 0.2 °C, 2012
Max 1hr Temp Fall 2.0 °C 18:55 1.5 °C 2.9 °C, 2013 0.8 °C, 2012
Max 1hr Hum Fall 14% 11:07 7% 14%, 2018 4%, 2022
Max 10m Wind Speed 6.1 mph 13:45 9.0 mph 15.6 mph, 2021 4.6 mph, 2015
Minimum Feels-like 5.3 °C 04:58 10.1 °C 15.4 °C, 2023 -3.0 °C, 2010
Maximum Feels-like 18.3 °C 16:11 20.4 °C 21.9 °C, 2024 0.0 °C, 2009
Mean Feels-like 11.8 °C 15.2 °C 18.1 °C, 2021 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0.7 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.2 °C (+5.2) 7.6 °C (+1.3) 11.2 °C (+5.2), 2018 2.4 °C (-3.6), 2017
Humidity Range 31% 25% 43%, 2010 8%, 2022
Pressure Range 4 hPa 6 hPa 19 hPa, 2021 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9.2 [99%]92 hrs (116%) [47%] 9.2 [99%], 2010 0 [0%], 2009
Wet Hours 028 hrs (87%) [5.7%] 11, 2021 0, 2010
Cloud Cover am: Sunny or Mostly Sunny
pm: Sunny
Events Maximum possible sunshine
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 20th October 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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