Daily Report for 18th October 2011

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.0 °C (-0.5) 14:25 11.4 °C (+2.2) 16.4 °C (+7.9), 2014 2.8 °C (-5.7), 2009
Maximum Temperature 14.5 °C (-0.1) 00:08 18.6 °C (+3.0) 19.5 °C (+4.9), 2014 12.3 °C (-2.3), 2020
Mean Temperature 10.5 °C (-0.3) 14.8 °C (+2.6) 17.8 °C, 2014 7.1 °C, 2009
Minimum Humidity 42% 15:29 57% 84%, 2021 42%, 2011
Maximum Humidity 87% 06:56 88% 98%, 2013 84%, 2016
Mean Humidity 66% 73% 92%, 2021 66%, 2011
Minimum Pressure 1006 hPa 01:42 1017 hPa 1026 hPa, 2022 984 hPa, 2023
Maximum Pressure 1012 hPa 22:33 1022 hPa 1030 hPa, 2022 1003 hPa, 2019
Mean Pressure 1009 hPa 1020 hPa 1028 hPa, 2022 996 hPa, 2023
Mean Wind Speed 7.2 mph (+3.1) 5.6 mph (+1.5) 9.0 mph, 2016 1.0 mph, 2020
Maximum Wind Speed 15.4 mph 13.4 mph 23.1 mph, 2016 5.5 mph, 2009
Maximum Gust 26.1 mph 12:17 20.3 mph 35.5 mph, 2016 7.5 mph, 2009
Mean Wind Direction WSW
Rainfall 3.3 mm 9.1 mm (24%) 11.0 mm, 2023
Maximum Hourly Rain 2.7 mm 03:04 4.0 mm, 2017
Maximum 10-min Rain 1.7 mm 02:10 2.4 mm, 2019
Maximum Rain Rate 50 mm/h 02:10 66 mm/h, 2019
Minimum Dew Point -0.5 °C 14:58 7.4 °C 14.8 °C, 2014 -0.5 °C, 2011
Maximum Dew Point 11.0 °C 02:06 12.9 °C 15.9 °C, 2014 4.0 °C, 2009
Mean Dew Point 4.0 °C 9.8 °C 15.4 °C, 2014 2.5 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.0 °C 05:20 11.7 °C 16.2 °C, 2014 2.8 °C, 2009
Day Maximum (09-21) * 12.4 °C * 12:50 18.2 °C 19.5 °C, 2014 12.3 °C, 2020
Max 10m Temp Rise 0.4 °C 08:39 0.5 °C 0.9 °C, 2022 0.2 °C, 2012
Max 1hr Temp Rise 1.7 °C 09:22 2.2 °C 3.3 °C, 2022 0.8 °C, 2016
Max 1hr Hum Rise 10% 01:11 7% 10%, 2011 3%, 2021
Max 10m Temp Fall 0.2 °C 02:21 0.3 °C 0.8 °C, 2019 0.1 °C, 2017
Max 1hr Temp Fall 0.8 °C 03:06 1.1 °C 1.6 °C, 2019 0.2 °C, 2017
Max 1hr Hum Fall 8% 13:07 9% 14%, 2016 4%, 2023
Max 10m Wind Speed 11.7 mph 00:02 9.1 mph 18.2 mph, 2016 0.2 mph, 2020
Minimum Feels-like 5.3 °C 07:54 11.9 °C 20.2 °C, 2014 0.0 °C, 2009
Maximum Feels-like 15.5 °C 00:13 20.7 °C 23.8 °C, 2014 0.0 °C, 2009
Mean Feels-like 9.9 °C 16.3 °C 22.0 °C, 2014 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 6.5 °C (+0.4) 7.2 °C (+0.8) 10.5 °C (+4.4), 2022 3.1 °C (-3.0), 2014
Humidity Range 45% 31% 45%, 2011 14%, 2021
Pressure Range 6 hPa 5 hPa 26 hPa, 2023 3 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [85%]85 hrs (119%) [48%] 8 [85%], 2011 0 [0%], 2017
Wet Hours 1.5
[Mean rain rate: 2.2 mm/h]		9.6 hrs (34%) [2.2%] 7, 2023 0, 2009
Cloud Cover Mostly Sunny with periods of Sunny
Events None
Comments 0030 Light Shower; 02 Heavy Shower, - 03 Light Rain
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 18th 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

daycamsumdaycamsum2

Wind rose