Daily Report for 30th November 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.8 °C (-4.9) 05:36 4.5 °C (-0.9) 8.6 °C (+4.5), 2015 -2.9 °C (-7.0), 2016
Maximum Temperature 3.1 °C (-6.3) 14:26 10.3 °C (-0.4) 13.1 °C (+3.7), 2015 1.0 °C (-8.4), 2010
Mean Temperature 1.5 °C (-5.6) 7.6 °C (-0.6) 11.3 °C, 2015 0.3 °C, 2010
Minimum Humidity 68% 15:36 71% 87%, 2010 62%, 2016
Maximum Humidity 86% 22:35 93% 98%, 2009 80%, 2016
Mean Humidity 77% 84% 94%, 2010 71%, 2016
Minimum Pressure 1011 hPa 14:47 1013 hPa 1032 hPa, 2016 985 hPa, 2009
Maximum Pressure 1014 hPa 00:30 1020 hPa 1035 hPa, 2016 1006 hPa, 2023
Mean Pressure 1012 hPa 1016 hPa 1034 hPa, 2016 998 hPa, 2009
Mean Wind Speed 6.2 mph (+1.6) 4.7 mph (+0.1) 8.9 mph, 2021 1.0 mph, 2016
Maximum Wind Speed 13.9 mph 23:06 12.3 mph 21.0 mph, 2015 5.3 mph, 2022
Maximum Gust 23.0 mph 20:26 19.1 mph 37.3 mph, 2015 8.1 mph, 2022
Mean Wind Direction NW
Rainfall 0.0 mm 38.2 mm (57%) 15.3 mm, 2009
Maximum Hourly Rain n/a 4.1, 2009
Maximum 10-min Rain n/a 1, 2015
Maximum Rain Rate n/a 36, 2015
Minimum Dew Point -3.5 °C 08:37 2.0 °C 5.3 °C, 2022 -6.4 °C, 2016
Maximum Dew Point -0.1 °C 23:05 7.3 °C 11.5 °C, 2015 -0.7 °C, 2016
Mean Dew Point -2.1 °C 5.0 °C 8.4 °C, 2015 -3.8 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.8 °C 05:36 5.2 °C 8.6 °C, 2015 -2.9 °C, 2016
Day Maximum (09-21) 3.1 °C 14:26 10.1 °C 13.0 °C, 2015 1.0 °C, 2010
Max 10m Temp Rise 0.3 °C 13:06 0.4 °C 0.8 °C, 2016 0.1 °C, 2010
Max 1hr Temp Rise 1.2 °C 10:35 1.3 °C 2.8 °C, 2016 0.4 °C, 2010
Max 1hr Hum Rise 7% 18:25 6% 9%, 2011 2%, 2010
Max 10m Temp Fall 0.2 °C 00:32 0.4 °C 0.6 °C, 2015 0.1 °C, 2010
Max 1hr Temp Fall 0.7 °C 01:25 1.3 °C 2.8 °C, 2015 0.3 °C, 2021
Max 1hr Hum Fall 4% 09:27 8% 15%, 2020 3%, 2021
Max 10m Wind Speed 10.5 mph 21:54 9.2 mph 15.7 mph, 2015 3.9 mph, 2022
Minimum Feels-like -6.1 °C 06:14 1.5 °C 5.8 °C, 2015 -7.4 °C, 2010
Maximum Feels-like 1.3 °C 17:09 10.5 °C 15.1 °C, 2015 0.8 °C, 2010
Mean Feels-like -2.7 °C 6.4 °C 11.6 °C, 2015 -3.9 °C, 2010
Air-frost Hrs 4 hrs 0.2 hrs 13 hrs, 2012 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-1.4) 5.8 °C (+0.5) 8.7 °C (+3.4), 2016 1.8 °C (-3.5), 2010
Humidity Range 18% 22% 24%, 2020 8%, 2021
Pressure Range 3 hPa 7 hPa 25 hPa, 2009 3 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [41%]85 hrs (101%) [36%] 7.2 [98%], 2016 0 [0%], 2010
Wet Hours 042 hrs (66%) [5.8%] 10, 2009 0, 2012
Cloud Cover am: Sunny transitioned to Partly Cloudy
pm: Partly Cloudy
Events Air Frost
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 30th November 2017.
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

daycamsumLarge resolution version

Wind rose