Daily Report for 4th October 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.8 °C (+6.0) 07:38 14.0 °C (+4.2) 15.8 °C (+6.0), 2011 5.1 °C (-4.7), 2024
Maximum Temperature 18.7 °C (+2.3) 16:01 24.4 °C (+7.9) 20.4 °C (+4.0), 2013 10.9 °C (-5.5), 2020
Mean Temperature 17.2 °C (+4.1) 18.9 °C (+6.0) 17.7 °C, 2013 9.8 °C, 2020
Minimum Humidity 65% 15:32 44% 92%, 2020 49%, 2025
Maximum Humidity 81% 23:59 86% 98%, 2010 81%, 2011
Mean Humidity 75% 66% 95%, 2010 69%, 2009
Minimum Pressure 1018 hPa 01:42 1020 hPa 1030 hPa, 2016 981 hPa, 2020
Maximum Pressure 1021 hPa 11:50 1024 hPa 1032 hPa, 2016 989 hPa, 2020
Mean Pressure 1020 hPa 1022 hPa 1031 hPa, 2016 984 hPa, 2020
Mean Wind Speed 6.4 mph (+2.3) 4.2 mph (+0.1) 10.5 mph, 2025 1.4 mph, 2024
Maximum Wind Speed 13.2 mph 12.2 mph 22.6 mph, 2025 7.1 mph, 2010
Maximum Gust 19.4 mph 15:05 17.6 mph 38.0 mph, 2025 10.5 mph, 2010
Mean Wind Direction WSW
Rainfall 0.0 mm 0.0 mm (0%) 23.0 mm, 2020
Maximum Hourly Rain n/a 4, 2021
Maximum 10-min Rain n/a 2.2, 2021
Maximum Rain Rate n/a 30, 2021
Minimum Dew Point 11.7 °C 10:03 10.0 °C 12.8 °C, 2013 3.5 °C, 2025
Maximum Dew Point 14.0 °C 00:13 15.1 °C 17.4 °C, 2013 9.0 °C, 2012
Mean Dew Point 12.7 °C 11.9 °C 15.2 °C, 2013 7.0 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.8 °C 07:37 14.0 °C 16.3 °C, 2013 5.1 °C, 2024
Day Maximum (09-21) 18.7 °C 16:01 24.4 °C 20.4 °C, 2013 10.6 °C, 2020
Max 10m Temp Rise 0.4 °C 13:27 0.8 °C 0.6 °C, 2012 0.2 °C, 2020
Max 1hr Temp Rise 1.4 °C 13:54 3.6 °C 3.1 °C, 2015 0.7 °C, 2020
Max 1hr Hum Rise 7% 13:02 10% 16%, 2021 2%, 2020
Max 10m Temp Fall 0.3 °C 12:32 0.3 °C 1.3 °C, 2025 0.2 °C, 2022
Max 1hr Temp Fall 1.3 °C 12:52 1.0 °C 2.9 °C, 2024 0.7 °C, 2022
Max 1hr Hum Fall 3% 14:12 6% 18%, 2024 1%, 2020
Max 10m Wind Speed 9.3 mph 14:22 8.2 mph 18.1 mph, 2025 5.2 mph, 2010
Minimum Feels-like 18.1 °C 07:24 15.8 °C 18.6 °C, 2013 0.0 °C, 2009
Maximum Feels-like 21.2 °C 13:55 26.9 °C 24.5 °C, 2013 0.0 °C, 2009
Mean Feels-like 19.8 °C 21.2 °C 21.8 °C, 2013 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.9 °C (-3.7) 10.4 °C (+3.8) 11.2 °C (+4.6), 2024 2.0 °C (-4.6), 2020
Humidity Range 16% 43% 44%, 2025 3%, 2020
Pressure Range 3 hPa 4 hPa 13 hPa, 2025 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [10%]30 hrs (183%) [73%] 9 [87%], 2016 0 [0%], 2020
Wet Hours 00 hrs (0%) [0%] 18, 2020 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Mostly Cloudy transitioned to Overcast
Events None
Comments -
Extra Comments
Issues Wind data loss at multiple times (generally overnight)
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 4th October 2011.
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

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Wind rose