Daily Report for 11th April 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.6 °C (+0.8) 09:39 6.8 °C (+1.2) 12.5 °C (+6.8), 2024 0.7 °C (-5.0), 2021
Maximum Temperature 11.1 °C (-2.8) 00:05 12.3 °C (-1.3) 24.8 °C (+10.9), 2020 8.1 °C (-5.8), 2021
Mean Temperature 8.7 °C (-1.0) 9.4 °C (-0.1) 16.4 °C, 2020 3.9 °C, 2021
Minimum Humidity 90% 15:17 71% 93%, 2009 25%, 2025
Maximum Humidity 97% 23:47 91% 98%, 2013 69%, 2017
Mean Humidity 94% 83% 96%, 2009 55%, 2014
Minimum Pressure 1006 hPa 04:42 1001 hPa 1027 hPa, 2010 994 hPa, 2012
Maximum Pressure 1009 hPa 12:21 1010 hPa 1032 hPa, 2024 999 hPa, 2013
Mean Pressure 1008 hPa 1006 hPa 1030 hPa, 2024 997 hPa, 2013
Mean Wind Speed 3.5 mph (-1.4) 5.2 mph (+0.3) 8.3 mph, 2023 1.8 mph, 2009
Maximum Wind Speed 10.3 mph 03:03 13.8 mph 22.3 mph, 2023 7.8 mph, 2014
Maximum Gust 13.8 mph 02:16 21.5 mph 32.3 mph, 2023 11.0 mph, 2009
Mean Wind Direction NE
Rainfall 2.4 mm 38.1 mm (247%) 4.3 mm, 2023
Maximum Hourly Rain 0.9 mm 05:03 2.0 mm, 2016
Maximum 10-min Rain 0.2 mm 05:47 0.5 mm, 2015
Maximum Rain Rate 0.8 mm/h 04:21 18 mm/h, 2015
Minimum Dew Point 5.9 °C 09:39 4.2 °C 11.2 °C, 2024 -4.4 °C, 2015
Maximum Dew Point 10.0 °C 00:05 8.4 °C 14.6 °C, 2024 1.2 °C, 2021
Mean Dew Point 7.7 °C 6.5 °C 12.4 °C, 2024 -1.1 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.8 °C * 08:58 6.9 °C 11.7 °C, 2024 0.7 °C, 2021
Day Maximum (09-21) * 9.3 °C * 15:34 12.1 °C 24.8 °C, 2020 8.1 °C, 2021
Max 10m Temp Rise 0.3 °C 11:27 0.4 °C 0.9 °C, 2011 0.3 °C, 2009
Max 1hr Temp Rise 0.9 °C 13:52 1.5 °C 4.0 °C, 2025 0.4 °C, 2009
Max 1hr Hum Rise 3% 19:46 6% 24%, 2021 2%, 2009
Max 10m Temp Fall 0.4 °C 05:33 0.4 °C 1.7 °C, 2021 0.3 °C, 2009
Max 1hr Temp Fall 1.1 °C 06:22 1.3 °C 3.5 °C, 2020 0.6 °C, 2009
Max 1hr Hum Fall 3% 13:57 7% 27%, 2015 1%, 2009
Max 10m Wind Speed 6.5 mph 09:38 10.1 mph 18.4 mph, 2023 6.0 mph, 2025
Minimum Feels-like 3.2 °C 09:09 3.4 °C 14.4 °C, 2024 -3.5 °C, 2019
Maximum Feels-like 12.4 °C 00:00 12.9 °C 25.7 °C, 2020 7.6 °C, 2021
Mean Feels-like 7.6 °C 8.5 °C 17.4 °C, 2024 2.3 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.5 °C (-3.7) 5.5 °C (-2.5) 17.0 °C (+8.8), 2025 1.7 °C (-6.5), 2009
Humidity Range 7% 19% 65%, 2025 4%, 2009
Pressure Range 3 hPa 9 hPa 16 hPa, 2023 3 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]20 hrs (35%) [15%] 12.3 [101%], 2025 0 [0%], 2009
Wet Hours 6
[Mean rain rate: 0.4 mm/h]		54 hrs (317%) [20%] 8, 2013 0, 2010
Cloud Cover Overcast
Events None
Comments overnight Rain; day sl spells
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 11th April 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose