Daily Report for 31st October 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.8 °C (-7.9) 06:53 8.2 °C (-0.3) 13.4 °C (+6.3), 2014 -0.8 °C (-7.9), 2018
Maximum Temperature 12.5 °C (-0.3) 12:47 15.8 °C (+1.1) 21.3 °C (+8.5), 2014 10.9 °C (-1.9), 2019
Mean Temperature 6.8 °C (-4.1) 11.8 °C (+0.4) 16.7 °C, 2014 6.8 °C, 2018
Minimum Humidity 63% 14:29 67% 85%, 2010 54%, 2014
Maximum Humidity 95% 08:08 92% 98%, 2009 81%, 2016
Mean Humidity 81% 81% 94%, 2009 77%, 2012
Minimum Pressure 1005 hPa 00:01 1015 hPa 1025 hPa, 2024 978 hPa, 2012
Maximum Pressure 1009 hPa 10:10 1022 hPa 1030 hPa, 2017 999 hPa, 2012
Mean Pressure 1007 hPa 1018 hPa 1028 hPa, 2024 989 hPa, 2012
Mean Wind Speed 2.6 mph (-1.5) 4.1 mph (+0.0) 9.6 mph, 2021 0.5 mph, 2016
Maximum Wind Speed 15.1 mph 12:19 12.3 mph 22.4 mph, 2021 5.0 mph, 2024
Maximum Gust 21.9 mph 12:07 19.8 mph 36.5 mph, 2021 8.1 mph, 2024
Mean Wind Direction SE
Rainfall 0.4 mm 36.3 mm (56%) 7.2 mm, 2021
Maximum Hourly Rain 0.4 mm 23:31 3.8 mm, 2021
Maximum 10-min Rain 0.2 mm 1.2 mm, 2021
Maximum Rain Rate 0.7 mm/h 23:31 18 mm/h, 2020
Minimum Dew Point -2.0 °C 05:44 6.1 °C 11.0 °C, 2014 -2.0 °C, 2018
Maximum Dew Point 8.1 °C 23:53 11.0 °C 16.8 °C, 2009 7.4 °C, 2019
Mean Dew Point 3.6 °C 8.6 °C 13.1 °C, 2014 3.6 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.8 °C 06:37 8.8 °C 15.2 °C, 2011 -0.8 °C, 2018
Day Maximum (09-21) 12.5 °C 12:48 15.5 °C 21.3 °C, 2014 10.9 °C, 2019
Max 10m Temp Rise 1.1 °C 11:00 0.5 °C 1.1 °C, 2016 0.2 °C, 2010
Max 1hr Temp Rise 4.5 °C 11:10 1.9 °C 4.5 °C, 2018 0.4 °C, 2013
Max 1hr Hum Rise 6% 21:20 7% 10%, 2021 3%, 2010
Max 10m Temp Fall 0.4 °C 00:49 0.4 °C 1.0 °C, 2021 0.2 °C, 2010
Max 1hr Temp Fall 2.1 °C 03:30 1.5 °C 2.4 °C, 2016 0.6 °C, 2012
Max 1hr Hum Fall 15% 11:13 8% 15%, 2009 3%, 2010
Max 10m Wind Speed 10.2 mph 12:03 8.8 mph 17.5 mph, 2021 3.3 mph, 2024
Minimum Feels-like -0.8 °C 06:15 7.0 °C 16.0 °C, 2014 -0.8 °C, 2018
Maximum Feels-like 12.5 °C 12:47 17.6 °C 25.0 °C, 2014 11.0 °C, 2019
Mean Feels-like 6.5 °C 12.4 °C 19.6 °C, 2014 6.5 °C, 2018
Air-frost Hrs 3 hrs 0.1 hrs 3 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.3 °C (+7.6) 7.5 °C (+1.4) 13.3 °C (+7.6), 2018 1.6 °C (-4.1), 2013
Humidity Range 32% 25% 42%, 2014 10%, 2016
Pressure Range 4 hPa 6 hPa 21 hPa, 2012 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [92%]153 hrs (130%) [52%] 8 [92%], 2018 0 [0%], 2013
Wet Hours 1
[Mean rain rate: 0.4 mm/h]		32 hrs (64%) [4.2%] 5, 2020 0, 2011
Cloud Cover Sunny with periods of Mostly Sunny
Events Air Frost
Comments 23- Rain
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 31st 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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