Daily Report for 7th May 2015

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.5 °C (+1.7) 06:17 8.7 °C (+1.1) 14.4 °C (+6.6), 2011 3.9 °C (-3.9), 2012
Maximum Temperature 17.3 °C (+0.5) 14:05 16.0 °C (-0.5) 27.8 °C (+11.0), 2018 12.8 °C (-4.0), 2010
Mean Temperature 12.9 °C (+1.1) 12.1 °C (+0.3) 19.0 °C, 2018 8.6 °C, 2010
Minimum Humidity 39% 14:07 46% 70%, 2009 28%, 2018
Maximum Humidity 83% 07:07 89% 94%, 2024 76%, 2016
Mean Humidity 61% 69% 82%, 2022 52%, 2013
Minimum Pressure 1010 hPa 00:56 999 hPa 1025 hPa, 2022 1005 hPa, 2016
Maximum Pressure 1016 hPa 16:00 1008 hPa 1030 hPa, 2022 1008 hPa, 2016
Mean Pressure 1014 hPa 1004 hPa 1027 hPa, 2022 1006 hPa, 2016
Mean Wind Speed 7.1 mph (+2.4) 7.9 mph (+3.2) 9.1 mph, 2009 2.5 mph, 2016
Maximum Wind Speed 20.0 mph 00:10 18.3 mph 20.0 mph, 2015 9.0 mph, 2023
Maximum Gust 31.0 mph 00:09 28.6 mph 34.0 mph, 2009 11.5 mph, 2023
Mean Wind Direction SW
Rainfall 0.0 mm 23.6 mm (227%) 2.0 mm, 2012
Maximum Hourly Rain n/a 1.2, 2012
Maximum 10-min Rain n/a 0.6, 2012
Maximum Rain Rate n/a 4.2, 2012
Minimum Dew Point 1.1 °C 20:01 2.8 °C 10.4 °C, 2023 -0.3 °C, 2021
Maximum Dew Point 8.4 °C 08:34 9.7 °C 15.1 °C, 2011 3.6 °C, 2010
Mean Dew Point 5.0 °C 6.1 °C 12.2 °C, 2023 1.6 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.5 °C 06:17 8.7 °C 14.4 °C, 2011 3.9 °C, 2012
Day Maximum (09-21) 17.3 °C 14:05 16.0 °C 27.8 °C, 2018 12.8 °C, 2010
Max 10m Temp Rise 0.6 °C 10:29 0.6 °C 1.0 °C, 2013 0.4 °C, 2009
Max 1hr Temp Rise 1.8 °C 11:19 2.0 °C 4.8 °C, 2018 1.2 °C, 2009
Max 1hr Hum Rise 5% 22:41 9% 15%, 2011 4%, 2020
Max 10m Temp Fall 0.4 °C 15:14 0.5 °C 0.8 °C, 2014 0.3 °C, 2010
Max 1hr Temp Fall 1.3 °C 18:59 1.4 °C 2.6 °C, 2018 0.9 °C, 2012
Max 1hr Hum Fall 11% 11:30 15% 24%, 2018 4%, 2009
Max 10m Wind Speed 17.6 mph 00:10 14.3 mph 17.6 mph, 2015 5.9 mph, 2023
Minimum Feels-like 5.5 °C 06:04 6.4 °C 15.7 °C, 2011 0.4 °C, 2021
Maximum Feels-like 17.3 °C 13:58 16.7 °C 29.6 °C, 2018 12.8 °C, 2010
Mean Feels-like 12.4 °C 12.1 °C 20.3 °C, 2011 7.4 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.8 °C (-1.1) 7.4 °C (-1.6) 18.7 °C (+9.8), 2018 6.1 °C (-2.8), 2009
Humidity Range 44% 43% 60%, 2018 12%, 2009
Pressure Range 6 hPa 9 hPa 14 hPa, 2019 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [29%]27 hrs (66%) [28%] 13.8 [101%], 2018 0.7 [5%], 2009
Wet Hours 017 hrs (183%) [9.8%] 3, 2012 0, 2009
Cloud Cover Partly Cloudy with periods of Mostly Cloudy
Events None
Comments -
Extra Comments
Issues wind sensor out of battery; data reconstructed
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 7th May 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