Daily Report for 22nd January 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -3.6 °C (-6.5) 06:47 1.2 °C (-1.9) 7.6 °C (+4.7), 2018 -4.8 °C (-7.7), 2013
Maximum Temperature 5.0 °C (-2.8) 14:54 7.0 °C (-0.8) 12.4 °C (+4.6), 2024 2.5 °C (-5.3), 2013
Mean Temperature -0.5 °C (-4.6) 4.1 °C (-1.3) 9.6 °C, 2024 -0.9 °C, 2023
Minimum Humidity 68% 16:29 66% 90%, 2020 47%, 2012
Maximum Humidity 81% 23:45 83% 98%, 2010 79%, 2012
Mean Humidity 75% 76% 97%, 2010 63%, 2012
Minimum Pressure 1024 hPa 08:54 1021 hPa 1038 hPa, 2022 983 hPa, 2009
Maximum Pressure 1026 hPa 22:11 1028 hPa 1040 hPa, 2020 995 hPa, 2021
Mean Pressure 1025 hPa 1024 hPa 1038 hPa, 2020 991 hPa, 2009
Mean Wind Speed 0.3 mph (-4.9) 3.4 mph (-1.8) 11.5 mph, 2024 0.3 mph, 2017
Maximum Wind Speed 5.2 mph 13:28 10.4 mph 25.3 mph, 2024 4.5 mph, 2023
Maximum Gust 7.3 mph 13:31 15.2 mph 40.3 mph, 2024 6.9 mph, 2023
Mean Wind Direction SW
Rainfall 0.0 mm 48.0 mm (115%) 9.0 mm, 2010
Maximum Hourly Rain n/a 4.3, 2014
Maximum 10-min Rain n/a 1.2, 2024
Maximum Rain Rate n/a 30, 2024
Minimum Dew Point -7.6 °C 00:18 -2.7 °C 4.1 °C, 2014 -7.6 °C, 2017
Maximum Dew Point 0.4 °C 14:07 2.9 °C 11.0 °C, 2024 0.4 °C, 2015
Mean Dew Point -4.4 °C 0.1 °C 6.6 °C, 2024 -4.4 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -3.6 °C 06:47 2.1 °C 8.4 °C, 2024 -4.8 °C, 2013
Day Maximum (09-21) 5.0 °C 14:54 6.9 °C 11.6 °C, 2012 2.5 °C, 2013
Max 10m Temp Rise 0.5 °C 13:37 0.3 °C 1.0 °C, 2023 0.1 °C, 2010
Max 1hr Temp Rise 1.7 °C 13:37 1.3 °C 2.2 °C, 2023 0.6 °C, 2010
Max 1hr Hum Rise 5% 18:06 5% 12%, 2019 2%, 2020
Max 10m Temp Fall 0.5 °C 16:40 0.4 °C 0.9 °C, 2024 0.1 °C, 2010
Max 1hr Temp Fall 2.2 °C 17:16 1.4 °C 2.3 °C, 2024 0.2 °C, 2010
Max 1hr Hum Fall 5% 14:32 7% 12%, 2012 0%, 2010
Max 10m Wind Speed 4.5 mph 13:33 7.9 mph 19.5 mph, 2024 3.5 mph, 2023
Minimum Feels-like -3.6 °C 05:38 -2.1 °C 4.6 °C, 2018 -8.8 °C, 2013
Maximum Feels-like 5.0 °C 14:32 6.6 °C 14.2 °C, 2024 1.1 °C, 2013
Mean Feels-like -0.7 °C 2.4 °C 7.7 °C, 2024 -2.6 °C, 2013
Air-frost Hrs 16 hrs 3 hrs 17 hrs, 2023 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.6 °C (+3.8) 5.8 °C (+1.1) 8.6 °C (+3.8), 2017 2.5 °C (-2.3), 2018
Humidity Range 13% 17% 35%, 2009 5%, 2020
Pressure Range 2 hPa 7 hPa 24 hPa, 2024 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [91%]64 hrs (133%) [39%] 7 [91%], 2017 0 [0%], 2010
Wet Hours 064 hrs (134%) [12%] 12, 2010 , 2009
Cloud Cover Sunny
Events Air Frost
Comments -
Extra Comments
Issues 08-13 data loss due to computer problem
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 22nd January 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