Daily Report for 15th July 2017

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.4 °C (+1.1) 00:03 15.6 °C (+1.8) 17.9 °C (+3.6), 2014 10.7 °C (-3.6), 2024
Maximum Temperature 22.0 °C (-1.1) 18:09 24.9 °C (+2.1) 30.1 °C (+7.0), 2013 18.6 °C (-4.5), 2020
Mean Temperature 18.3 °C (-0.0) 20.2 °C (+1.9) 23.6 °C, 2013 15.2 °C, 2012
Minimum Humidity 61% 00:06 44% 71%, 2021 22%, 2013
Maximum Humidity 78% 14:07 78% 95%, 2010 66%, 2013
Mean Humidity 68% 59% 82%, 2024 41%, 2013
Minimum Pressure 1020 hPa 00:26 1013 hPa 1025 hPa, 2016 999 hPa, 2010
Maximum Pressure 1025 hPa 18:39 1020 hPa 1027 hPa, 2016 1005 hPa, 2023
Mean Pressure 1023 hPa 1017 hPa 1026 hPa, 2016 1002 hPa, 2023
Mean Wind Speed 4.1 mph (-0.2) 3.4 mph (-0.9) 11.2 mph, 2023 0.8 mph, 2024
Maximum Wind Speed 11.2 mph 17:17 10.6 mph 26.0 mph, 2023 5.9 mph, 2013
Maximum Gust 17.8 mph 17:48 16.0 mph 42.6 mph, 2023 7.6 mph, 2013
Mean Wind Direction WSW
Rainfall 0.0 mm 39.6 mm (178%) 28.8 mm, 2024
Maximum Hourly Rain n/a 14.4, 2024
Maximum 10-min Rain n/a 4.6, 2024
Maximum Rain Rate n/a 60, 2024
Minimum Dew Point 7.9 °C 00:03 8.6 °C 11.9 °C, 2009 4.2 °C, 2013
Maximum Dew Point 15.6 °C 21:08 14.1 °C 18.4 °C, 2015 11.9 °C, 2011
Mean Dew Point 12.4 °C 11.6 °C 15.4 °C, 2015 8.4 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 14.8 °C * 22:57 15.6 °C 17.9 °C, 2014 10.7 °C, 2024
Day Maximum (09-21) 22.0 °C 18:09 24.9 °C 30.1 °C, 2013 18.6 °C, 2020
Max 10m Temp Rise 0.4 °C 14:51 0.6 °C 1.7 °C, 2009 0.4 °C, 2017
Max 1hr Temp Rise 1.5 °C 15:31 2.3 °C 4.3 °C, 2011 1.0 °C, 2020
Max 1hr Hum Rise 6% 13:05 8% 18%, 2024 3%, 2015
Max 10m Temp Fall 0.2 °C 20:09 0.5 °C 1.6 °C, 2009 0.2 °C, 2017
Max 1hr Temp Fall 0.9 °C 23:00 1.9 °C 2.8 °C, 2018 0.9 °C, 2017
Max 1hr Hum Fall 6% 15:53 9% 20%, 2012 5%, 2020
Max 10m Wind Speed 8.4 mph 14:07 8.0 mph 21.6 mph, 2023 3.6 mph, 2013
Minimum Feels-like 15.8 °C 00:00 17.1 °C 20.7 °C, 2014 11.8 °C, 2024
Maximum Feels-like 26.1 °C 17:42 27.4 °C 32.3 °C, 2018 18.9 °C, 2012
Mean Feels-like 20.9 °C 22.3 °C 25.6 °C, 2018 16.0 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.6 °C (-2.2) 9.3 °C (+0.3) 15.8 °C (+7.0), 2018 4.5 °C (-4.3), 2015
Humidity Range 17% 34% 62%, 2018 15%, 2020
Pressure Range 5 hPa 6 hPa 11 hPa, 2009 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]102 hrs (106%) [46%] 14 [95%], 2013 0 [0%], 2017
Wet Hours 014 hrs (85%) [3.9%] 6, 2024 0, 2011
Cloud Cover Overcast
Events None
Comments -
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 15th July 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