Daily Report for 30th June 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.5 °C (+0.4) 05:11 11.5 °C (-0.6) 17.2 °C (+4.1), 2010 8.5 °C (-4.6), 2014
Maximum Temperature 29.4 °C (+7.2) 16:07 21.1 °C (+0.1) 29.4 °C (+7.2), 2009 17.6 °C (-4.5), 2021
Mean Temperature 22.4 °C (+3.8) 16.4 °C (-0.2) 22.4 °C, 2015 14.7 °C, 2021
Minimum Humidity 24% 14:33 42% 70%, 2021 24%, 2015
Maximum Humidity 73% 06:00 80% 95%, 2014 72%, 2010
Mean Humidity 45% 61% 82%, 2021 45%, 2015
Minimum Pressure 1014 hPa 23:57 1016 hPa 1024 hPa, 2011 999 hPa, 2017
Maximum Pressure 1022 hPa 01:00 1022 hPa 1026 hPa, 2011 1010 hPa, 2016
Mean Pressure 1018 hPa 1019 hPa 1025 hPa, 2011 1004 hPa, 2017
Mean Wind Speed 3.9 mph (-0.5) 5.0 mph (+0.6) 8.5 mph, 2012 1.8 mph, 2014
Maximum Wind Speed 14.5 mph 16:24 13.2 mph 20.5 mph, 2016 9.0 mph, 2014
Maximum Gust 19.9 mph 16:23 19.0 mph 27.7 mph, 2012 12.1 mph, 2014
Mean Wind Direction SE
Rainfall 0.0 mm 9.4 mm (20%) 7.0 mm, 2022
Maximum Hourly Rain n/a 6.8, 2022
Maximum 10-min Rain n/a 6.3, 2022
Maximum Rain Rate n/a 90, 2022
Minimum Dew Point 6.0 °C 14:10 5.2 °C 11.0 °C, 2019 4.8 °C, 2011
Maximum Dew Point 11.4 °C 19:36 11.2 °C 18.4 °C, 2019 9.5 °C, 2011
Mean Dew Point 9.0 °C 8.2 °C 14.0 °C, 2009 6.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.5 °C 05:11 11.6 °C 17.2 °C, 2010 8.5 °C, 2014
Day Maximum (09-21) 29.4 °C 16:07 21.1 °C 29.4 °C, 2009 17.6 °C, 2021
Max 10m Temp Rise 0.7 °C 06:40 0.6 °C 0.9 °C, 2018 0.3 °C, 2021
Max 1hr Temp Rise 3.3 °C 07:28 2.2 °C 3.3 °C, 2015 1.3 °C, 2021
Max 1hr Hum Rise 9% 19:20 9% 28%, 2022 6%, 2021
Max 10m Temp Fall 0.6 °C 19:17 0.5 °C 1.6 °C, 2009 0.3 °C, 2016
Max 1hr Temp Fall 2.2 °C 19:20 1.8 °C 3.6 °C, 2022 0.9 °C, 2020
Max 1hr Hum Fall 13% 09:06 11% 17%, 2014 6%, 2020
Max 10m Wind Speed 9.3 mph 16:33 9.6 mph 16.4 mph, 2016 5.4 mph, 2021
Minimum Feels-like 14.0 °C 05:05 11.3 °C 19.3 °C, 2010 8.6 °C, 2011
Maximum Feels-like 30.5 °C 16:52 22.3 °C 31.0 °C, 2019 20.2 °C, 2021
Mean Feels-like 23.2 °C 17.2 °C 23.8 °C, 2019 15.9 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 15.9 °C (+6.8) 9.6 °C (+0.7) 15.9 °C (+6.8), 2015 4.9 °C (-4.2), 2021
Humidity Range 49% 38% 57%, 2009 20%, 2020
Pressure Range 8 hPa 6 hPa 11 hPa, 2017 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 15 [99%]190 hrs (98%) [42%] 15 [99%], 2015 0.3 [2%], 2020
Wet Hours 010 hrs (28%) [1.4%] 3, 2016 0, 2009
Cloud Cover Sunny
Events Maximum possible sunshine
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 30th June 2015.
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