Daily Report for 15th March 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.2 °C (-1.1) 01:53 1.7 °C (-2.2) 9.3 °C (+5.0), 2019 -0.7 °C (-5.0), 2023
Maximum Temperature 8.5 °C (-2.3) 12:24 7.4 °C (-2.8) 17.2 °C (+6.4), 2014 6.8 °C (-4.0), 2015
Mean Temperature 6.0 °C (-1.7) 4.5 °C (-2.5) 12.4 °C, 2024 4.1 °C, 2025
Minimum Humidity 52% 00:14 60% 77%, 2011 32%, 2014
Maximum Humidity 91% 22:09 90% 98%, 2011 79%, 2014
Mean Humidity 77% 77% 91%, 2011 58%, 2014
Minimum Pressure 1001 hPa 23:59 1008 hPa 1028 hPa, 2016 988 hPa, 2018
Maximum Pressure 1013 hPa 01:00 1013 hPa 1036 hPa, 2017 993 hPa, 2018
Mean Pressure 1007 hPa 1010 hPa 1033 hPa, 2017 991 hPa, 2018
Mean Wind Speed 8.4 mph (+3.2) 5.5 mph (+0.3) 11.3 mph, 2019 1.8 mph, 2017
Maximum Wind Speed 19.4 mph 23:24 13.8 mph 24.1 mph, 2019 7.7 mph, 2017
Maximum Gust 28.4 mph 15:21 19.9 mph 47.2 mph, 2019 10.5 mph, 2017
Mean Wind Direction SW
Rainfall 3.7 mm 23.8 mm (126%) 4.8 mm, 2018
Maximum Hourly Rain 1.2 mm 06:53 1.5 mm, 2018
Maximum 10-min Rain 0.6 mm 06:26 0.6 mm, 2013
Maximum Rain Rate 2.1 mm/h 06:34 7 mm/h, 2024
Minimum Dew Point -5.4 °C 00:27 -2.4 °C 7.3 °C, 2019 -5.4 °C, 2013
Maximum Dew Point 5.6 °C 22:55 3.2 °C 11.8 °C, 2024 1.3 °C, 2025
Mean Dew Point 2.1 °C 0.5 °C 9.9 °C, 2024 -1.6 °C, 2025
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.2 °C 01:53 2.3 °C 11.4 °C, 2024 -0.7 °C, 2023
Day Maximum (09-21) 8.5 °C 12:24 7.3 °C 17.2 °C, 2014 6.8 °C, 2015
Max 10m Temp Rise 0.3 °C 08:54 0.4 °C 0.9 °C, 2012 0.2 °C, 2015
Max 1hr Temp Rise 1.4 °C 09:45 1.4 °C 4.0 °C, 2012 0.6 °C, 2015
Max 1hr Hum Rise 7% 05:45 7% 13%, 2021 4%, 2011
Max 10m Temp Fall 0.4 °C 12:44 0.4 °C 1.2 °C, 2020 0.2 °C, 2015
Max 1hr Temp Fall 0.7 °C 16:13 1.1 °C 2.8 °C, 2020 0.6 °C, 2015
Max 1hr Hum Fall 6% 10:38 8% 20%, 2012 2%, 2016
Max 10m Wind Speed 14.5 mph 23:29 10.4 mph 19.3 mph, 2019 6.0 mph, 2017
Minimum Feels-like -1.1 °C 04:56 -2.4 °C 6.5 °C, 2017 -4.0 °C, 2025
Maximum Feels-like 6.2 °C 11:30 6.4 °C 17.6 °C, 2024 5.5 °C, 2015
Mean Feels-like 2.7 °C 2.1 °C 13.5 °C, 2024 1.1 °C, 2025
Air-frost Hrs 0 hrs 3 hrs 2 hrs, 2023 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.3 °C (-1.2) 5.8 °C (-0.6) 14.2 °C (+7.7), 2012 2.2 °C (-4.3), 2015
Humidity Range 39% 29% 47%, 2010 15%, 2020
Pressure Range 12 hPa 5 hPa 16 hPa, 2017 3 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]36 hrs (68%) [23%] 10.4 [98%], 2009 0 [0%], 2013
Wet Hours 8
[Mean rain rate: 0.5 mm/h]		53 hrs (208%) [15%] 8, 2013 , 2009
Cloud Cover Overcast
Events None
Comments 05-08 broken Light, 1230, 15-22 broken Slight Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 15th March 2013.
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.
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Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose