Daily Report for 13th July 2012

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.0 °C (-0.3) 00:15 13.6 °C (-0.2) 18.7 °C (+4.4), 2022 11.8 °C (-2.5), 2016
Maximum Temperature 19.9 °C (-3.2) 14:10 19.6 °C (-3.3) 30.3 °C (+7.2), 2013 17.2 °C (-5.9), 2011
Mean Temperature 16.2 °C (-1.8) 16.3 °C (-1.8) 24.2 °C, 2022 14.6 °C, 2011
Minimum Humidity 54% 14:13 59% 78%, 2015 32%, 2020
Maximum Humidity 96% 05:42 92% 96%, 2012 77%, 2017
Mean Humidity 80% 79% 87%, 2015 54%, 2017
Minimum Pressure 1000 hPa 19:41 1007 hPa 1023 hPa, 2013 1000 hPa, 2012
Maximum Pressure 1006 hPa 01:03 1012 hPa 1028 hPa, 2020 1006 hPa, 2012
Mean Pressure 1002 hPa 1009 hPa 1024 hPa, 2013 1002 hPa, 2012
Mean Wind Speed 6.1 mph (+1.8) 4.9 mph (+0.6) 6.3 mph, 2009 1.6 mph, 2024
Maximum Wind Speed 13.7 mph 14:05 12.3 mph 16.9 mph, 2016 7.7 mph, 2019
Maximum Gust 18.5 mph 01:49 16.9 mph 26.0 mph, 2009 12.6 mph, 2017
Mean Wind Direction SW
Rainfall 4.6 mm 68.6 mm (356%) 16.9 mm, 2018
Maximum Hourly Rain 2.3 mm 21:21 13.4 mm, 2018
Maximum 10-min Rain 1.1 mm 21:06 4.8 mm, 2018
Maximum Rain Rate 10 mm/h 21:02 40 mm/h, 2018
Minimum Dew Point 10.1 °C 13:00 10.2 °C 14.6 °C, 2015 5.1 °C, 2011
Maximum Dew Point 14.3 °C 08:18 14.4 °C 17.9 °C, 2013 10.1 °C, 2011
Mean Dew Point 12.5 °C 12.3 °C 15.6 °C, 2015 7.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.8 °C * 22:30 13.8 °C 20.9 °C, 2022 11.8 °C, 2016
Day Maximum (09-21) 19.9 °C 14:12 19.6 °C 30.3 °C, 2013 17.2 °C, 2011
Max 10m Temp Rise 0.6 °C 11:32 0.6 °C 0.7 °C, 2013 0.3 °C, 2015
Max 1hr Temp Rise 1.7 °C 09:02 2.0 °C 3.5 °C, 2013 1.0 °C, 2015
Max 1hr Hum Rise 11% 15:34 10% 28%, 2018 4%, 2015
Max 10m Temp Fall 0.6 °C 17:01 0.6 °C 1.3 °C, 2016 0.1 °C, 2015
Max 1hr Temp Fall 1.4 °C 15:53 1.7 °C 3.9 °C, 2018 0.5 °C, 2015
Max 1hr Hum Fall 18% 09:12 12% 18%, 2012 6%, 2024
Max 10m Wind Speed 12.1 mph 14:07 10.5 mph 13.6 mph, 2016 5.7 mph, 2013
Minimum Feels-like 16.8 °C 00:00 15.7 °C 23.0 °C, 2022 12.6 °C, 2017
Maximum Feels-like 21.7 °C 14:18 22.3 °C 34.4 °C, 2013 17.3 °C, 2011
Mean Feels-like 18.7 °C 18.8 °C 28.5 °C, 2022 15.1 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.9 °C (-3.0) 6.0 °C (-3.1) 15.6 °C (+6.8), 2013 3.6 °C (-5.2), 2015
Humidity Range 42% 32% 53%, 2020 13%, 2015
Pressure Range 6 hPa 5 hPa 8 hPa, 2020 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]40 hrs (47%) [20%] 12 [81%], 2013 0 [0%], 2015
Wet Hours 4
[Mean rain rate: 1.1 mm/h]		56 hrs (390%) [18%] 5, 2015 0, 2011
Cloud Cover Mostly Cloudy
Events None
Comments -02 Light Rain; pm occasional Light, 2030-23 Heavy Showers
Extra Comments delayed rain tip at 0845
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th July 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

daycamsum

Wind rose