Daily Report for 19th January 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -1.4 °C (-4.3) 07:01 1.7 °C (-1.4) 8.6 °C (+5.7), 2021 -3.5 °C (-6.4), 2016
Maximum Temperature 5.7 °C (-2.1) 14:10 7.3 °C (-0.5) 11.7 °C (+3.9), 2021 0.4 °C (-7.4), 2013
Mean Temperature 1.8 °C (-3.2) 4.6 °C (-1.0) 10.3 °C, 2021 -0.9 °C, 2016
Minimum Humidity 61% 13:59 68% 95%, 2010 55%, 2016
Maximum Humidity 80% 09:00 83% 98%, 2010 80%, 2017
Mean Humidity 72% 77% 98%, 2010 72%, 2017
Minimum Pressure 1034 hPa 20:55 1020 hPa 1037 hPa, 2020 977 hPa, 2009
Maximum Pressure 1038 hPa 09:24 1028 hPa 1050 hPa, 2020 998 hPa, 2009
Mean Pressure 1036 hPa 1024 hPa 1045 hPa, 2020 988 hPa, 2009
Mean Wind Speed 1.0 mph (-4.2) 3.7 mph (-1.5) 12.1 mph, 2021 0.3 mph, 2016
Maximum Wind Speed 6.1 mph 14:05 10.9 mph 21.8 mph, 2021 5.4 mph, 2016
Maximum Gust 10.5 mph 14:06 16.1 mph 38.0 mph, 2009 6.2 mph, 2016
Mean Wind Direction ENE
Rainfall 0.0 mm 48.0 mm (133%) 13.0 mm, 2009
Maximum Hourly Rain n/a 7, 2009
Maximum 10-min Rain n/a 0.9, 2012
Maximum Rain Rate n/a 15, 2012
Minimum Dew Point -5.1 °C 02:00 -2.0 °C 7.5 °C, 2021 -7.8 °C, 2016
Maximum Dew Point -0.5 °C 11:20 3.5 °C 11.3 °C, 2012 -0.7 °C, 2016
Mean Dew Point -2.7 °C 0.8 °C 8.6 °C, 2021 -4.9 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -1.4 °C 07:01 2.7 °C 8.1 °C, 2012 -3.5 °C, 2016
Day Maximum (09-21) 5.7 °C 14:10 7.2 °C 11.7 °C, 2021 0.4 °C, 2013
Max 10m Temp Rise 0.6 °C 07:55 0.3 °C 0.8 °C, 2016 0.1 °C, 2010
Max 1hr Temp Rise 2.0 °C 10:23 1.2 °C 2.9 °C, 2016 0.3 °C, 2010
Max 1hr Hum Rise 4% 17:37 4% 9%, 2012 1%, 2010
Max 10m Temp Fall 0.2 °C 15:56 0.4 °C 1.9 °C, 2012 0.1 °C, 2013
Max 1hr Temp Fall 0.9 °C 17:17 1.4 °C 3.5 °C, 2012 0.3 °C, 2013
Max 1hr Hum Fall 9% 12:26 6% 13%, 2012 1%, 2010
Max 10m Wind Speed 4.5 mph 12:51 8.3 mph 16.1 mph, 2021 3.3 mph, 2016
Minimum Feels-like -2.8 °C 05:34 -1.8 °C 4.9 °C, 2021 -8.0 °C, 2024
Maximum Feels-like 5.6 °C 13:42 6.9 °C 13.5 °C, 2012 0.3 °C, 2013
Mean Feels-like 1.1 °C 2.8 °C 9.8 °C, 2021 -4.3 °C, 2013
Air-frost Hrs 8 hrs 2 hrs 17 hrs, 2016 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (+2.2) 5.6 °C (+0.8) 7.2 °C (+2.3), 2024 1.2 °C (-3.7), 2025
Humidity Range 19% 16% 36%, 2012 3%, 2010
Pressure Range 4 hPa 8 hPa 21 hPa, 2009 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [79%]42 hrs (101%) [30%] 7.6 [100%], 2020 0 [0%], 2010
Wet Hours 064 hrs (155%) [14%] 6, 2012 , 2009
Cloud Cover am: Partly Cloudy transitioned to Sunny
pm: Sunny
Events Air Frost
Comments -
Extra Comments mysterious false tip removed
Issues None known
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 19th 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.
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Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose