Daily Report for 23rd May 2012

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.8 °C (+2.8) 05:34 7.9 °C (-0.8) 12.8 °C (+2.8), 2012 5.4 °C (-4.6), 2021
Maximum Temperature 25.6 °C (+7.0) 16:14 15.0 °C (-2.5) 29.1 °C (+10.5), 2010 11.0 °C (-7.6), 2013
Mean Temperature 18.9 °C (+4.9) 11.5 °C (-1.7) 19.4 °C, 2010 8.1 °C, 2013
Minimum Humidity 53% 15:38 58% 64%, 2018 33%, 2009
Maximum Humidity 87% 07:05 89% 94%, 2024 71%, 2014
Mean Humidity 73% 75% 79%, 2024 51%, 2019
Minimum Pressure 1020 hPa 01:16 1012 hPa 1026 hPa, 2023 1001 hPa, 2022
Maximum Pressure 1026 hPa 22:25 1019 hPa 1029 hPa, 2023 1008 hPa, 2014
Mean Pressure 1023 hPa 1015 hPa 1028 hPa, 2023 1004 hPa, 2022
Mean Wind Speed 2.7 mph (-2.0) 4.8 mph (+0.1) 10.8 mph, 2020 2.4 mph, 2010
Maximum Wind Speed 6.4 mph 12.1 mph 23.3 mph, 2020 6.4 mph, 2012
Maximum Gust 8.7 mph 01:54 17.5 mph 39.2 mph, 2020 8.7 mph, 2012
Mean Wind Direction N
Rainfall 0.0 mm 44.3 mm (130%) 4.6 mm, 2021
Maximum Hourly Rain n/a 2, 2015
Maximum 10-min Rain n/a 1, 2021
Maximum Rain Rate n/a 14.4, 2021
Minimum Dew Point 10.3 °C 05:27 4.4 °C 10.3 °C, 2012 -2.2 °C, 2013
Maximum Dew Point 16.8 °C 18:12 9.5 °C 16.8 °C, 2012 2.8 °C, 2013
Mean Dew Point 13.7 °C 7.0 °C 13.7 °C, 2012 0.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.8 °C 05:33 8.3 °C 13.0 °C, 2015 5.4 °C, 2021
Day Maximum (09-21) 25.6 °C 16:14 15.0 °C 29.1 °C, 2010 11.0 °C, 2013
Max 10m Temp Rise 0.7 °C 10:25 0.6 °C 1.0 °C, 2013 0.5 °C, 2010
Max 1hr Temp Rise 2.9 °C 10:36 2.0 °C 2.9 °C, 2012 1.7 °C, 2014
Max 1hr Hum Rise 7% 18:35 8% 21%, 2013 6%, 2018
Max 10m Temp Fall 0.4 °C 18:28 0.4 °C 1.6 °C, 2020 0.4 °C, 2012
Max 1hr Temp Fall 1.7 °C 19:16 1.5 °C 3.9 °C, 2022 1.3 °C, 2021
Max 1hr Hum Fall 10% 11:09 10% 22%, 2009 6%, 2017
Max 10m Wind Speed 5.0 mph 00:02 7.9 mph 16.7 mph, 2021 5.0 mph, 2012
Minimum Feels-like 14.2 °C 05:24 6.5 °C 14.2 °C, 2012 2.2 °C, 2013
Maximum Feels-like 30.3 °C 16:14 16.2 °C 31.2 °C, 2010 11.0 °C, 2013
Mean Feels-like 22.2 °C 11.8 °C 22.2 °C, 2012 6.5 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 12.8 °C (+4.2) 7.1 °C (-1.7) 18.5 °C (+9.9), 2010 4.9 °C (-3.7), 2014
Humidity Range 34% 31% 59%, 2010 19%, 2017
Pressure Range 6 hPa 7 hPa 11 hPa, 2016 1 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [55%]70 hrs (50%) [22%] 14.6 [101%], 2010 1 [7%], 2022
Wet Hours 037 hrs (125%) [6.7%] 5, 2021 0, 2009
Cloud Cover am: Overcast transitioned to Sunny
pm: Sunny transitioned to Hazy
Events None
Comments -
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 23rd May 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

daycamsumdaycamsum2

Wind rose