Daily Report for 12th April 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.1 °C (+0.3) 23:40 6.7 °C (+1.1) 11.1 °C (+5.3), 2020 0.7 °C (-5.1), 2021
Maximum Temperature 9.9 °C (-4.1) 14:02 12.1 °C (-1.5) 24.9 °C (+10.9), 2020 9.7 °C (-4.3), 2021
Mean Temperature 7.8 °C (-1.9) 9.3 °C (-0.2) 17.2 °C, 2020 4.5 °C, 2021
Minimum Humidity 91% 15:55 73% 92%, 2009 32%, 2020
Maximum Humidity 97% 04:36 91% 97%, 2009 75%, 2015
Mean Humidity 95% 84% 95%, 2009 54%, 2015
Minimum Pressure 1003 hPa 21:16 1002 hPa 1028 hPa, 2024 989 hPa, 2023
Maximum Pressure 1007 hPa 00:06 1010 hPa 1033 hPa, 2021 999 hPa, 2023
Mean Pressure 1005 hPa 1005 hPa 1030 hPa, 2021 994 hPa, 2023
Mean Wind Speed 3.8 mph (-1.1) 5.1 mph (+0.2) 9.6 mph, 2023 1.3 mph, 2021
Maximum Wind Speed 10.3 mph 10:48 13.5 mph 27.5 mph, 2023 7.9 mph, 2021
Maximum Gust 15.0 mph 10:49 21.0 mph 47.2 mph, 2023 13.7 mph, 2021
Mean Wind Direction NNE
Rainfall trace 38.2 mm (227%) 10.2, 2013
Maximum Hourly Rain n/a 3.8, 2012
Maximum 10-min Rain n/a 2.3, 2012
Maximum Rain Rate n/a 20, 2012
Minimum Dew Point 5.2 °C 22:36 4.3 °C 8.2 °C, 2009 -4.8 °C, 2021
Maximum Dew Point 8.8 °C 13:55 8.5 °C 14.5 °C, 2024 1.5 °C, 2021
Mean Dew Point 7.0 °C 6.5 °C 10.8 °C, 2024 -1.6 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.5 °C * 07:41 6.9 °C 11.1 °C, 2020 0.7 °C, 2021
Day Maximum (09-21) 9.9 °C 14:02 11.9 °C 24.9 °C, 2020 9.7 °C, 2021
Max 10m Temp Rise 0.4 °C 12:14 0.4 °C 1.0 °C, 2009 0.4 °C, 2010
Max 1hr Temp Rise 1.4 °C 12:42 1.5 °C 3.4 °C, 2012 1.2 °C, 2009
Max 1hr Hum Rise 2% 16:46 6% 20%, 2012 2%, 2009
Max 10m Temp Fall 0.3 °C 17:28 0.4 °C 2.0 °C, 2015 0.3 °C, 2010
Max 1hr Temp Fall 1.2 °C 18:14 1.3 °C 5.1 °C, 2015 0.5 °C, 2009
Max 1hr Hum Fall 3% 12:58 7% 19%, 2016 2%, 2009
Max 10m Wind Speed 6.5 mph 19:17 9.8 mph 23.2 mph, 2023 6.1 mph, 2021
Minimum Feels-like 2.9 °C 21:10 3.4 °C 11.3 °C, 2020 -2.5 °C, 2019
Maximum Feels-like 9.8 °C 00:00 12.6 °C 25.3 °C, 2020 9.3 °C, 2019
Mean Feels-like 6.2 °C 8.3 °C 17.8 °C, 2020 3.7 °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 3.8 °C (-4.4) 5.4 °C (-2.6) 14.4 °C (+6.2), 2015 3.2 °C (-5.0), 2009
Humidity Range 6% 18% 49%, 2020 5%, 2009
Pressure Range 4 hPa 8 hPa 14 hPa, 2013 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]20 hrs (32%) [14%] 11 [90%], 2011 0 [0%], 2009
Wet Hours 0.554 hrs (293%) [19%] 6, 2013 0, 2010
Cloud Cover Overcast
Events None
Comments some Rain/Drizzle and mist
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 12th 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