Daily Report for 4th July 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 17.6 °C (+4.2) 05:33 16.5 °C (+3.1) 17.6 °C (+4.2), 2015 10.6 °C (-2.8), 2019
Maximum Temperature 26.6 °C (+4.1) 16:47 28.3 °C (+5.8) 26.7 °C (+4.2), 2014 19.1 °C (-3.4), 2023
Mean Temperature 21.8 °C (+4.1) 22.5 °C (+4.4) 21.8 °C, 2015 15.3 °C, 2023
Minimum Humidity 40% 17:09 37% 79%, 2020 33%, 2014
Maximum Humidity 91% 05:57 79% 96%, 2012 66%, 2011
Mean Humidity 65% 58% 86%, 2020 47%, 2011
Minimum Pressure 1013 hPa 04:00 1013 hPa 1022 hPa, 2019 1003 hPa, 2014
Maximum Pressure 1020 hPa 21:47 1021 hPa 1029 hPa, 2019 1012 hPa, 2024
Mean Pressure 1017 hPa 1017 hPa 1026 hPa, 2019 1008 hPa, 2014
Mean Wind Speed 5.6 mph (+1.3) 5.0 mph (+0.8) 9.3 mph, 2020 1.5 mph, 2019
Maximum Wind Speed 14.7 mph 14:55 13.4 mph 17.6 mph, 2016 7.1 mph, 2019
Maximum Gust 19.2 mph 11:55 19.0 mph 30.0 mph, 2020 10.4 mph, 2019
Mean Wind Direction SSW
Rainfall 4.8 mm 4.9 mm (83%) 9.5 mm, 2012
Maximum Hourly Rain 2.4 mm 01:43 3.1 mm, 2023
Maximum 10-min Rain 2.3 mm 01:41 2.3 mm, 2015
Maximum Rain Rate 72 mm/h 00:20 72 mm/h, 2015
Minimum Dew Point 8.3 °C 20:49 9.7 °C 14.5 °C, 2012 5.9 °C, 2014
Maximum Dew Point 18.4 °C 09:01 15.9 °C 18.4 °C, 2015 9.8 °C, 2011
Mean Dew Point 14.2 °C 13.0 °C 15.7 °C, 2012 8.1 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 17.6 °C 05:33 16.9 °C 17.6 °C, 2015 10.6 °C, 2019
Day Maximum (09-21) 26.6 °C 16:47 28.3 °C 26.7 °C, 2014 19.1 °C, 2023
Max 10m Temp Rise 0.4 °C 07:08 0.7 °C 1.0 °C, 2009 0.4 °C, 2015
Max 1hr Temp Rise 1.9 °C 09:50 2.5 °C 3.2 °C, 2011 1.5 °C, 2023
Max 1hr Hum Rise 14% 01:04 11% 19%, 2018 5%, 2012
Max 10m Temp Fall 0.6 °C 19:52 0.6 °C 0.9 °C, 2022 0.3 °C, 2012
Max 1hr Temp Fall 2.2 °C 20:38 2.2 °C 2.5 °C, 2014 0.8 °C, 2012
Max 1hr Hum Fall 20% 10:13 13% 20%, 2015 6%, 2020
Max 10m Wind Speed 10.5 mph 15:51 10.4 mph 14.5 mph, 2016 4.8 mph, 2019
Minimum Feels-like 19.8 °C 23:57 18.2 °C 19.9 °C, 2012 11.3 °C, 2019
Maximum Feels-like 30.1 °C 13:41 31.3 °C 30.1 °C, 2015 21.3 °C, 2023
Mean Feels-like 25.4 °C 25.4 °C 25.4 °C, 2015 17.5 °C, 2023
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.0 °C (-0.1) 11.8 °C (+2.8) 16.0 °C (+6.9), 2019 5.0 °C (-4.1), 2020
Humidity Range 51% 42% 55%, 2019 14%, 2020
Pressure Range 7 hPa 8 hPa 11 hPa, 2014 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12 [80%]36 hrs (139%) [60%] 14 [93%], 2019 0 [0%], 2020
Wet Hours 1.5
[Mean rain rate: 3.2 mm/h]
2 hrs (46%) [2.1%] 8, 2023 0, 2009
Cloud Cover am: Partly Cloudy transitioned to Mostly Sunny
pm: Sunny
Events Light Thunderstorm
Comments 00-01 Thunderstorm with Heavy Showers
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 4th July 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose