Daily Report for 19th May 2017

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.7 °C (+0.3) 03:47 9.1 °C (+0.8) 13.5 °C (+4.1), 2022 6.2 °C (-3.2), 2018
Maximum Temperature 15.7 °C (-2.4) 16:38 16.7 °C (-0.5) 26.2 °C (+8.1), 2020 14.3 °C (-3.8), 2015
Mean Temperature 11.7 °C (-1.0) 12.6 °C (+0.2) 19.4 °C, 2014 10.1 °C, 2015
Minimum Humidity 58% 17:10 55% 59%, 2019 31%, 2014
Maximum Humidity 87% 04:55 83% 96%, 2019 77%, 2015
Mean Humidity 77% 71% 81%, 2019 54%, 2014
Minimum Pressure 1011 hPa 05:38 1012 hPa 1029 hPa, 2010 1000 hPa, 2015
Maximum Pressure 1015 hPa 22:46 1020 hPa 1031 hPa, 2010 1007 hPa, 2014
Mean Pressure 1012 hPa 1015 hPa 1030 hPa, 2010 1004 hPa, 2014
Mean Wind Speed 3.2 mph (-1.5) 4.4 mph (-0.3) 7.3 mph, 2015 1.2 mph, 2019
Maximum Wind Speed 7.7 mph 10:13 11.4 mph 19.2 mph, 2015 7.7 mph, 2017
Maximum Gust 11.5 mph 13:22 17.5 mph 24.4 mph, 2015 10.9 mph, 2011
Mean Wind Direction WNW
Rainfall 1.0 mm 64.3 mm (228%) 3.3 mm, 2015
Maximum Hourly Rain 0.5 mm 01:03 2.4 mm, 2015
Maximum 10-min Rain 0.3 mm 02:29 2.2 mm, 2015
Maximum Rain Rate 18 mm/h 36 mm/h, 2015
Minimum Dew Point 6.0 °C 23:18 4.8 °C 7.8 °C, 2020 1.4 °C, 2015
Maximum Dew Point 9.2 °C 09:11 9.4 °C 15.4 °C, 2024 5.6 °C, 2015
Mean Dew Point 7.6 °C 7.2 °C 11.8 °C, 2020 3.4 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.7 °C 03:47 9.5 °C 13.5 °C, 2022 6.2 °C, 2018
Day Maximum (09-21) 15.7 °C 16:38 16.7 °C 26.2 °C, 2020 14.3 °C, 2015
Max 10m Temp Rise 0.6 °C 16:07 0.6 °C 1.3 °C, 2009 0.5 °C, 2013
Max 1hr Temp Rise 1.9 °C 16:17 1.9 °C 4.3 °C, 2011 1.4 °C, 2016
Max 1hr Hum Rise 10% 18:32 9% 25%, 2015 6%, 2009
Max 10m Temp Fall 0.7 °C 17:55 0.5 °C 3.1 °C, 2015 0.3 °C, 2010
Max 1hr Temp Fall 2.3 °C 18:25 1.7 °C 4.6 °C, 2015 1.3 °C, 2009
Max 1hr Hum Fall 10% 12:50 10% 19%, 2014 6%, 2013
Max 10m Wind Speed 6.0 mph 11:04 8.6 mph 13.3 mph, 2015 5.1 mph, 2019
Minimum Feels-like 7.5 °C 03:10 7.8 °C 15.7 °C, 2022 3.7 °C, 2015
Maximum Feels-like 16.3 °C 16:36 17.6 °C 29.8 °C, 2020 14.3 °C, 2015
Mean Feels-like 11.7 °C 12.8 °C 21.6 °C, 2020 8.9 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.0 °C (-2.7) 7.6 °C (-1.2) 14.9 °C (+6.2), 2018 6.0 °C (-2.7), 2017
Humidity Range 29% 28% 60%, 2018 28%, 2023
Pressure Range 4 hPa 8 hPa 10 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [10%]66 hrs (58%) [25%] 14.3 [100%], 2018 0.3 [2%], 2019
Wet Hours 3
[Mean rain rate: 0.3 mm/h]
38 hrs (155%) [8.3%] 4, 2021 0, 2010
Cloud Cover am: Overcast
pm: Mostly Cloudy
Events None
Comments o.night Rain, 16 Shower
Extra Comments
Issues Rn data from N16
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th May 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