Daily Report for 13th January 2017

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.6 °C (-2.4) 02:30 2.6 °C (-0.5) 11.4 °C (+8.4), 2011 -0.5 °C (-3.5), 2013
Maximum Temperature 5.2 °C (-2.6) 16:29 7.9 °C (+0.1) 13.3 °C (+5.5), 2011 0.6 °C (-7.2), 2010
Mean Temperature 2.6 °C (-2.5) 5.4 °C (-0.2) 12.1 °C, 2011 0.3 °C, 2010
Minimum Humidity 57% 15:59 69% 90%, 2011 57%, 2017
Maximum Humidity 80% 11:20 83% 98%, 2010 78%, 2013
Mean Humidity 70% 77% 95%, 2011 70%, 2017
Minimum Pressure 1000 hPa 00:21 1017 hPa 1040 hPa, 2022 996 hPa, 2020
Maximum Pressure 1016 hPa 23:28 1026 hPa 1043 hPa, 2022 1001 hPa, 2010
Mean Pressure 1007 hPa 1021 hPa 1042 hPa, 2022 1000 hPa, 2010
Mean Wind Speed 8.9 mph (+3.7) 4.6 mph (-0.6) 10.3 mph, 2023 0.9 mph, 2021
Maximum Wind Speed 19.8 mph 11:00 12.3 mph 25.0 mph, 2020 6.0 mph, 2022
Maximum Gust 27.3 mph 09:26 18.1 mph 41.5 mph, 2020 8.0 mph, 2022
Mean Wind Direction NW
Rainfall / Snow-melt approx. 0.5 mm 34.8 mm (141%) 6.6 mm, 2015
Maximum Hourly Rain 0.5 mm 11:08 4.1 mm, 2015
Maximum 10-min Rain 0.3 mm 11:08 1.7 mm, 2015
Maximum Rain Rate 0.5 mm/h 11:08 42 mm/h, 2015
Minimum Dew Point -4.0 °C 08:25 -1.2 °C 10.5 °C, 2011 -4.4 °C, 2013
Maximum Dew Point -0.5 °C 12:24 4.3 °C 12.0 °C, 2011 -0.5 °C, 2017
Mean Dew Point -2.5 °C 1.6 °C 11.3 °C, 2011 -2.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.6 °C 02:30 3.9 °C 11.4 °C, 2011 -0.4 °C, 2010
Day Maximum (09-21) 5.2 °C 16:29 7.9 °C 13.3 °C, 2011 0.6 °C, 2010
Max 10m Temp Rise 0.5 °C 11:50 0.3 °C 0.5 °C, 2017 0.1 °C, 2010
Max 1hr Temp Rise 2.1 °C 12:24 1.1 °C 2.1 °C, 2017 0.3 °C, 2010
Max 1hr Hum Rise 14% 10:57 4% 14%, 2017 2%, 2011
Max 10m Temp Fall 0.3 °C 17:46 0.5 °C 1.2 °C, 2020 0.1 °C, 2010
Max 1hr Temp Fall 1.0 °C 18:34 1.5 °C 3.0 °C, 2020 0.2 °C, 2010
Max 1hr Hum Fall 10% 12:31 6% 12%, 2019 1%, 2010
Max 10m Wind Speed 14.7 mph 11:35 9.3 mph 18.1 mph, 2020 4.5 mph, 2022
Minimum Feels-like -5.7 °C 11:00 -1.3 °C 12.8 °C, 2011 -5.7 °C, 2017
Maximum Feels-like 3.2 °C 15:19 7.5 °C 15.6 °C, 2011 0.6 °C, 2010
Mean Feels-like -2.1 °C 3.2 °C 14.0 °C, 2011 -2.1 °C, 2017
Air-frost Hrs 0 hrs 1 hrs 5 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.6 °C (-0.2) 5.4 °C (+0.6) 9.2 °C (+4.4), 2021 1.0 °C (-3.8), 2010
Humidity Range 23% 15% 29%, 2012 5%, 2024
Pressure Range 16 hPa 9 hPa 25 hPa, 2020 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [14%]21 hrs (74%) [22%] 7.4 [100%], 2022 0 [0%], 2010
Wet Hours 1
[Mean rain rate: 0.5 mm/h]
42 hrs (148%) [13%] 10, 2021 , 2009
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events Snowfall: ~0.5 cm
Lying Snow (at 09z): trace amount
Comments 10-11 Snow Showers; early traces of Snow on Heath
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 13th 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