Daily Report for 30th January 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.5 °C (-3.5) 05:02 4.1 °C (+1.1) 7.6 °C (+4.6), 2020 -2.3 °C (-5.3), 2019
Maximum Temperature 3.3 °C (-4.5) 13:45 9.2 °C (+1.4) 12.4 °C (+4.6), 2020 3.0 °C (-4.8), 2010
Mean Temperature 1.7 °C (-4.0) 6.6 °C (+1.2) 9.9 °C, 2020 0.1 °C, 2010
Minimum Humidity 61% 16:14 67% 96%, 2014 48%, 2016
Maximum Humidity 91% 06:17 91% 98%, 2014 79%, 2010
Mean Humidity 80% 80% 98%, 2014 68%, 2009
Minimum Pressure 1023 hPa 23:06 1017 hPa 1023 hPa, 2012 974 hPa, 2015
Maximum Pressure 1028 hPa 04:02 1024 hPa 1036 hPa, 2024 981 hPa, 2015
Mean Pressure 1026 hPa 1020 hPa 1030 hPa, 2022 978 hPa, 2015
Mean Wind Speed 3.3 mph (-1.9) 5.5 mph (+0.3) 10.1 mph, 2013 2.4 mph, 2017
Maximum Wind Speed 6.9 mph 13.9 mph 23.9 mph, 2013 6.9 mph, 2012
Maximum Gust 8.7 mph 19:12 19.2 mph 35.5 mph, 2013 8.7 mph, 2012
Mean Wind Direction NNE
Rainfall 0.0 mm 42.7 mm (75%) 13.0 mm, 2021
Maximum Hourly Rain n/a 3.6, 2021
Maximum 10-min Rain n/a 1.5, 2013
Maximum Rain Rate n/a 30, 2013
Minimum Dew Point -4.2 °C 16:15 0.4 °C 5.7 °C, 2020 -5.4 °C, 2010
Maximum Dew Point 0.1 °C 09:50 6.3 °C 11.6 °C, 2013 -1.9 °C, 2010
Mean Dew Point -1.4 °C 3.3 °C 8.3 °C, 2020 -4.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.5 °C 05:01 4.8 °C 8.8 °C, 2013 -1.9 °C, 2010
Day Maximum (09-21) 3.3 °C 13:44 8.9 °C 12.4 °C, 2020 3.0 °C, 2010
Max 10m Temp Rise 0.3 °C 05:24 0.3 °C 0.7 °C, 2018 0.2 °C, 2010
Max 1hr Temp Rise 1.1 °C 06:10 1.1 °C 2.7 °C, 2018 0.5 °C, 2021
Max 1hr Hum Rise 9% 18:45 6% 9%, 2012 2%, 2014
Max 10m Temp Fall 0.3 °C 17:03 0.5 °C 0.6 °C, 2013 0.2 °C, 2010
Max 1hr Temp Fall 1.1 °C 04:54 1.3 °C 2.0 °C, 2013 0.7 °C, 2010
Max 1hr Hum Fall 11% 12:59 9% 20%, 2016 2%, 2014
Max 10m Wind Speed 5.6 mph 19:27 9.3 mph 17.3 mph, 2024 5.6 mph, 2012
Minimum Feels-like -2.0 °C 06:14 1.1 °C 3.9 °C, 2024 -7.0 °C, 2010
Maximum Feels-like 3.3 °C 12:48 9.2 °C 14.2 °C, 2013 0.4 °C, 2010
Mean Feels-like 0.8 °C 5.3 °C 9.2 °C, 2020 -3.6 °C, 2010
Air-frost Hrs 1 hrs 0.7 hrs 15 hrs, 2010 0 hrs, 2013
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.8 °C (-0.9) 5.1 °C (+0.3) 9.5 °C (+4.8), 2018 3.6 °C (-1.1), 2014
Humidity Range 30% 24% 46%, 2013 2%, 2014
Pressure Range 5 hPa 7 hPa 18 hPa, 2013 3 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [12%]76 hrs (113%) [34%] 7 [87%], 2010 0 [0%], 2014
Wet Hours 0.139 hrs (59%) [5.3%] 10, 2021 , 2009
Cloud Cover am: Overcast
pm: Overcast transitioned to Partly Cloudy
Events Air Frost
Comments possible eve Slight Rain/Snow
Extra Comments
Issues Wind data loss (10-19z) - not reconstructed
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 January 2012.
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

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Webcam Summary of Cloud Conditions

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Wind rose