Daily Report for 13th May 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.6 °C (+0.0) 23:15 7.0 °C (-1.0) 12.7 °C (+4.1), 2024 1.3 °C (-7.3), 2010
Maximum Temperature 15.2 °C (-2.2) 16:41 17.2 °C (+0.3) 24.0 °C (+6.6), 2025 11.9 °C (-5.5), 2020
Mean Temperature 12.1 °C (-1.1) 12.4 °C (-0.3) 17.2 °C, 2025 7.9 °C, 2010
Minimum Humidity 36% 16:26 39% 85%, 2023 33%, 2015
Maximum Humidity 92% 02:06 82% 94%, 2025 73%, 2015
Mean Humidity 62% 61% 89%, 2023 52%, 2015
Minimum Pressure 1009 hPa 18:04 1013 hPa 1038 hPa, 2019 1002 hPa, 2017
Maximum Pressure 1013 hPa 06:15 1018 hPa 1042 hPa, 2019 1009 hPa, 2021
Mean Pressure 1011 hPa 1016 hPa 1040 hPa, 2019 1007 hPa, 2017
Mean Wind Speed 8.5 mph (+3.8) 5.8 mph (+1.0) 8.5 mph, 2013 2.2 mph, 2014
Maximum Wind Speed 21.3 mph 15:38 15.2 mph 21.3 mph, 2013 7.4 mph, 2018
Maximum Gust 32.4 mph 15:40 22.2 mph 32.4 mph, 2013 10.4 mph, 2018
Mean Wind Direction W
Rainfall 0.3 mm 9.3 mm (48%) 4.3 mm, 2021
Maximum Hourly Rain 0.2 mm 1.7 mm, 2021
Maximum 10-min Rain 0.2 mm 1.4 mm, 2021
Maximum Rain Rate n/a 24, 2014
Minimum Dew Point -0.4 °C 18:27 0.8 °C 9.8 °C, 2024 -1.9 °C, 2019
Maximum Dew Point 10.1 °C 00:40 8.1 °C 13.4 °C, 2024 3.7 °C, 2010
Mean Dew Point 4.2 °C 4.3 °C 12.1 °C, 2024 0.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.9 °C * 06:08 7.3 °C 12.7 °C, 2024 1.3 °C, 2010
Day Maximum (09-21) 15.2 °C 16:41 17.2 °C 24.0 °C, 2025 11.9 °C, 2020
Max 10m Temp Rise 0.7 °C 12:42 0.9 °C 1.1 °C, 2012 0.3 °C, 2009
Max 1hr Temp Rise 1.4 °C 07:42 3.0 °C 4.5 °C, 2012 0.9 °C, 2009
Max 1hr Hum Rise 11% 17:30 11% 22%, 2019 2%, 2023
Max 10m Temp Fall 0.9 °C 20:16 0.7 °C 1.5 °C, 2014 0.2 °C, 2023
Max 1hr Temp Fall 2.2 °C 20:26 2.3 °C 3.2 °C, 2014 0.6 °C, 2009
Max 1hr Hum Fall 23% 08:46 18% 23%, 2013 3%, 2009
Max 10m Wind Speed 16.7 mph 15:47 11.2 mph 16.7 mph, 2013 4.8 mph, 2018
Minimum Feels-like 5.5 °C 23:26 5.2 °C 14.0 °C, 2024 -0.7 °C, 2010
Maximum Feels-like 15.2 °C 16:39 17.2 °C 25.6 °C, 2025 11.9 °C, 2020
Mean Feels-like 12.3 °C 12.2 °C 18.3 °C, 2024 7.1 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.6 °C (-2.2) 10.2 °C (+1.2) 13.7 °C (+4.9), 2012 3.1 °C (-5.7), 2023
Humidity Range 56% 43% 59%, 2019 7%, 2023
Pressure Range 4 hPa 5 hPa 15 hPa, 2012 3 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [43%]87 hrs (113%) [49%] 14 [100%], 2019 0 [0%], 2009
Wet Hours 114 hrs (84%) [4.5%] 6, 2021 0, 2010
Cloud Cover am: Mostly Cloudy or Hazy
pm: Partly Cloudy
Events None
Comments o.night Drizzle spells; 17, 20 Slight Showers
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 13th May 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