Daily Report for 28th April 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (-1.5) 23:46 4.6 °C (-1.5) 9.8 °C (+2.9), 2014 0.1 °C (-6.8), 2013
Maximum Temperature 9.3 °C (-6.6) 00:24 12.4 °C (-2.1) 22.9 °C (+7.0), 2025 9.3 °C (-6.6), 2012
Mean Temperature 8.1 °C (-4.0) 8.3 °C (-1.8) 16.3 °C, 2025 7.0 °C, 2009
Minimum Humidity 85% 00:12 51% 88%, 2018 31%, 2015
Maximum Humidity 97% 23:59 90% 97%, 2009 77%, 2015
Mean Humidity 94% 72% 94%, 2012 52%, 2015
Minimum Pressure 1012 hPa 23:47 999 hPa 1031 hPa, 2022 997 hPa, 2009
Maximum Pressure 1016 hPa 12:36 1009 hPa 1034 hPa, 2022 1005 hPa, 2009
Mean Pressure 1014 hPa 1004 hPa 1032 hPa, 2022 1001 hPa, 2009
Mean Wind Speed 6.9 mph (+2.0) 5.3 mph (+0.4) 7.4 mph, 2015 1.9 mph, 2017
Maximum Wind Speed 16.3 mph 14.9 mph 19.5 mph, 2016 7.4 mph, 2017
Maximum Gust 27.7 mph 19:52 21.4 mph 29.4 mph, 2016 10.5 mph, 2017
Mean Wind Direction NE
Rainfall 10.6 mm 83.4 mm (213%) 20.4 mm, 2024
Maximum Hourly Rain 2.2 mm 23:31 5.1 mm, 2024
Maximum 10-min Rain 0.6 mm 23:00 1.3 mm, 2016
Maximum Rain Rate 5.0 mm/h 23:01 42 mm/h, 2024
Minimum Dew Point 5.0 °C 23:45 0.2 °C 7.0 °C, 2023 -3.8 °C, 2015
Maximum Dew Point 8.5 °C 14:24 6.3 °C 12.8 °C, 2023 1.2 °C, 2015
Mean Dew Point 7.2 °C 3.3 °C 10.8 °C, 2023 -1.0 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.2 °C * 07:00 4.9 °C 9.8 °C, 2014 0.1 °C, 2013
Day Maximum (09-21) * 9.1 °C * 14:29 12.4 °C 22.9 °C, 2025 7.9 °C, 2020
Max 10m Temp Rise 0.2 °C 13:36 0.7 °C 1.4 °C, 2009 0.2 °C, 2012
Max 1hr Temp Rise 0.4 °C 08:49 2.5 °C 5.5 °C, 2013 0.3 °C, 2018
Max 1hr Hum Rise 3% 01:01 12% 17%, 2021 3%, 2012
Max 10m Temp Fall 0.2 °C 16:17 0.8 °C 0.9 °C, 2009 0.2 °C, 2012
Max 1hr Temp Fall 0.8 °C 18:33 2.1 °C 2.2 °C, 2023 0.8 °C, 2012
Max 1hr Hum Fall 2% 14:48 13% 18%, 2013 2%, 2012
Max 10m Wind Speed 11.6 mph 21:10 9.8 mph 14.2 mph, 2016 5.1 mph, 2017
Minimum Feels-like 0.0 °C 23:36 1.8 °C 8.3 °C, 2023 -1.4 °C, 2013
Maximum Feels-like 9.4 °C 00:43 12.4 °C 23.9 °C, 2025 9.4 °C, 2012
Mean Feels-like 5.9 °C 7.2 °C 16.8 °C, 2025 5.7 °C, 2020
Air-frost Hrs 0 hrs 0.2 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-5.1) 7.8 °C (-0.6) 15.3 °C (+6.3), 2025 3.2 °C (-5.8), 2018
Humidity Range 12% 39% 53%, 2013 7%, 2018
Pressure Range 4 hPa 9 hPa 18 hPa, 2024 2 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]107 hrs (71%) [30%] 13 [98%], 2025 0 [0%], 2012
Wet Hours 15
[Mean rain rate: 0.7 mm/h]		90 hrs (210%) [13%] 15, 2012 0, 2010
Cloud Cover Overcast
Events None
Comments 05- Slight/Light broken Rain/Drizzle (22- Light/Moderate)
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 28th April 2012.
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

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Wind rose