Daily Report for 1st April 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.2 °C (-1.1) 06:55 4.2 °C (-1.2) 11.8 °C (+6.5), 2011 -0.9 °C (-6.2), 2020
Maximum Temperature 10.8 °C (-2.0) 16:03 10.8 °C (-2.2) 18.5 °C (+5.7), 2014 5.3 °C (-7.5), 2013
Mean Temperature 7.6 °C (-1.6) 7.6 °C (-1.7) 13.5 °C, 2014 2.4 °C, 2013
Minimum Humidity 43% 13:39 43% 80%, 2023 36%, 2012
Maximum Humidity 87% 23:59 87% 95%, 2014 75%, 2013
Mean Humidity 56% 56% 88%, 2023 56%, 2015
Minimum Pressure 1017 hPa 23:55 1017 hPa 1021 hPa, 2009 998 hPa, 2023
Maximum Pressure 1025 hPa 11:23 1025 hPa 1030 hPa, 2020 1010 hPa, 2010
Mean Pressure 1022 hPa 1022 hPa 1026 hPa, 2021 1005 hPa, 2010
Mean Wind Speed 9.2 mph (+4.3) 9.2 mph (+4.3) 9.2 mph, 2015 1.0 mph, 2014
Maximum Wind Speed 17.6 mph 15:16 17.6 mph 19.7 mph, 2013 7.1 mph, 2014
Maximum Gust 28.6 mph 13:32 28.6 mph 35.4 mph, 2022 9.0 mph, 2012
Mean Wind Direction W
Rainfall 1.7 mm 1.7 mm (121%) 2.9 mm, 2018
Maximum Hourly Rain 1.5 mm 23:51 2.2 mm, 2018
Maximum 10-min Rain 0.5 mm 23:26 1.4 mm, 2014
Maximum Rain Rate 5 mm/h 23:20 20 mm/h, 2014
Minimum Dew Point -3.4 °C 06:21 -3.4 °C 9.4 °C, 2011 -7.2 °C, 2013
Maximum Dew Point 5.5 °C 23:59 5.5 °C 12.0 °C, 2014 -2.2 °C, 2013
Mean Dew Point -0.7 °C -0.7 °C 10.0 °C, 2011 -4.6 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.2 °C 06:55 4.2 °C 11.8 °C, 2011 -0.9 °C, 2020
Day Maximum (09-21) 10.8 °C 16:03 10.8 °C 18.5 °C, 2014 5.3 °C, 2013
Max 10m Temp Rise 0.5 °C 08:28 0.5 °C 1.2 °C, 2022 0.3 °C, 2011
Max 1hr Temp Rise 2.1 °C 09:04 2.1 °C 4.8 °C, 2016 1.0 °C, 2018
Max 1hr Hum Rise 13% 17:28 13% 23%, 2010 5%, 2011
Max 10m Temp Fall 0.4 °C 17:32 0.4 °C 2.7 °C, 2022 0.3 °C, 2014
Max 1hr Temp Fall 1.1 °C 22:54 1.1 °C 3.4 °C, 2021 0.9 °C, 2023
Max 1hr Hum Fall 7% 09:08 7% 19%, 2016 6%, 2023
Max 10m Wind Speed 13.5 mph 16:14 13.5 mph 14.8 mph, 2022 4.5 mph, 2014
Minimum Feels-like -0.9 °C 05:05 -0.9 °C 12.9 °C, 2011 -7.2 °C, 2022
Maximum Feels-like 10.8 °C 16:03 10.8 °C 18.9 °C, 2014 2.1 °C, 2013
Mean Feels-like 4.7 °C 4.7 °C 14.8 °C, 2011 -2.0 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 4 hrs, 2020 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.6 °C (-0.9) 6.6 °C (-1.0) 13.9 °C (+6.4), 2009 2.9 °C (-4.6), 2023
Humidity Range 44% 44% 48%, 2012 13%, 2023
Pressure Range 8 hPa 8 hPa 20 hPa, 2023 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [43%]5 hrs (100%) [43%] 11.5 [99%], 2019 0 [0%], 2018
Wet Hours 2
[Mean rain rate: 0.8 mm/h]
2 hrs (130%) [8.3%] 2, 2015 0, 2009
Cloud Cover am: Sunny transitioned to Mostly Sunny
pm: Mostly Cloudy
Events None
Comments 22- Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 1st April 2015.
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