Daily Report for 17th March 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.9 °C (-2.6) 06:18 2.4 °C (-1.6) 10.7 °C (+6.2), 2023 -1.7 °C (-6.2), 2018
Maximum Temperature 11.0 °C (-0.0) 14:16 9.1 °C (-1.3) 15.4 °C (+4.4), 2009 7.1 °C (-3.9), 2018
Mean Temperature 6.1 °C (-1.3) 5.7 °C (-1.5) 12.1 °C, 2024 0.5 °C, 2018
Minimum Humidity 43% 15:24 57% 79%, 2024 43%, 2016
Maximum Humidity 92% 08:03 89% 98%, 2011 78%, 2017
Mean Humidity 68% 76% 90%, 2024 65%, 2010
Minimum Pressure 1027 hPa 17:56 1010 hPa 1032 hPa, 2021 987 hPa, 2013
Maximum Pressure 1031 hPa 06:15 1019 hPa 1040 hPa, 2022 993 hPa, 2013
Mean Pressure 1030 hPa 1015 hPa 1034 hPa, 2009 990 hPa, 2013
Mean Wind Speed 2.8 mph (-2.4) 4.4 mph (-0.8) 10.9 mph, 2018 1.9 mph, 2009
Maximum Wind Speed 8.8 mph 10:37 11.0 mph 21.2 mph, 2018 7.8 mph, 2011
Maximum Gust 18.0 mph 10:37 19.2 mph 32.3 mph, 2018 10.7 mph, 2011
Mean Wind Direction NE
Rainfall 0.0 mm 26.7 mm (125%) 5.3 mm, 2023
Maximum Hourly Rain n/a 2.6, 2012
Maximum 10-min Rain n/a 1.5, 2012
Maximum Rain Rate n/a 15, 2012
Minimum Dew Point -3.6 °C 23:41 -1.9 °C 9.1 °C, 2023 -4.1 °C, 2018
Maximum Dew Point 5.0 °C 09:49 5.0 °C 12.2 °C, 2024 3.5 °C, 2025
Mean Dew Point -0.0 °C 1.5 °C 10.4 °C, 2024 -1.5 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 1.9 °C 06:18 2.8 °C 11.2 °C, 2023 -0.3 °C, 2018
Day Maximum (09-21) 11.0 °C 14:16 9.0 °C 15.4 °C, 2009 0.1 °C, 2018
Max 10m Temp Rise 0.6 °C 08:33 0.5 °C 1.2 °C, 2009 0.1 °C, 2018
Max 1hr Temp Rise 2.5 °C 09:13 1.6 °C 3.1 °C, 2009 0.4 °C, 2018
Max 1hr Hum Rise 6% 22:41 8% 28%, 2019 3%, 2020
Max 10m Temp Fall 0.5 °C 20:49 0.5 °C 2.3 °C, 2019 0.3 °C, 2015
Max 1hr Temp Fall 2.1 °C 21:20 1.5 °C 4.2 °C, 2019 0.9 °C, 2020
Max 1hr Hum Fall 22% 10:39 11% 22%, 2016 4%, 2012
Max 10m Wind Speed 5.9 mph 12:00 8.0 mph 16.7 mph, 2018 5.2 mph, 2011
Minimum Feels-like -2.6 °C 05:46 -1.3 °C 11.7 °C, 2023 -9.2 °C, 2018
Maximum Feels-like 11.0 °C 13:43 8.4 °C 17.0 °C, 2024 4.0 °C, 2018
Mean Feels-like 4.9 °C 3.5 °C 13.5 °C, 2024 -5.5 °C, 2018
Air-frost Hrs 0 hrs 0.4 hrs 15 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.1 °C (+2.6) 6.7 °C (+0.3) 10.4 °C (+3.9), 2022 3.3 °C (-3.2), 2023
Humidity Range 49% 33% 49%, 2016 13%, 2012
Pressure Range 4 hPa 9 hPa 18 hPa, 2019 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [84%]68 hrs (114%) [39%] 10 [93%], 2022 0 [0%], 2012
Wet Hours 027 hrs (93%) [6.6%] 12, 2018 , 2009
Cloud Cover am: Mostly Sunny
pm: Sunny
Events None
Comments -
Extra Comments
Issues Wind data from Tottenham (TODO: calibration)
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 17th March 2016.
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