Daily Report for 29th December 2015

<<Previous Day
Reset 		Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.7 °C (+6.3) 20:11 9.5 °C (+5.9) 9.7 °C (+6.3), 2015 -2.3 °C (-5.7), 2017
Maximum Temperature 12.4 °C (+4.6) 00:16 13.4 °C (+5.2) 14.6 °C (+6.8), 2021 3.7 °C (-4.1), 2020
Mean Temperature 10.9 °C (+5.5) 11.6 °C (+5.6) 11.0 °C, 2021 1.1 °C, 2014
Minimum Humidity 72% 00:02 72% 98%, 2010 69%, 2011
Maximum Humidity 87% 09:23 89% 98%, 2009 83%, 2011
Mean Humidity 82% 81% 98%, 2010 73%, 2011
Minimum Pressure 1012 hPa 04:23 1014 hPa 1037 hPa, 2014 983 hPa, 2020
Maximum Pressure 1022 hPa 16:58 1022 hPa 1042 hPa, 2014 1000 hPa, 2020
Mean Pressure 1017 hPa 1018 hPa 1040 hPa, 2014 991 hPa, 2020
Mean Wind Speed 7.1 mph (+2.0) 7.6 mph (+2.5) 10.8 mph, 2012 0.3 mph, 2016
Maximum Wind Speed 15.9 mph 23:11 17.7 mph 21.0 mph, 2022 4.4 mph, 2016
Maximum Gust 20.8 mph 23:10 26.3 mph 33.4 mph, 2022 6.3 mph, 2016
Mean Wind Direction SSW
Rainfall 2.6 mm 44.7 mm (84%) 11.5 mm, 2009
Maximum Hourly Rain 1.7 mm 06:12 4.4 mm, 2017
Maximum 10-min Rain 1.3 mm 06:12 1.9 mm, 2011
Maximum Rain Rate 72 mm/h 06:06 72 mm/h, 2015
Minimum Dew Point 6.5 °C 17:01 6.0 °C 6.6 °C, 2010 -3.3 °C, 2017
Maximum Dew Point 9.2 °C 03:57 10.7 °C 13.0 °C, 2021 1.1 °C, 2014
Mean Dew Point 7.8 °C 8.4 °C 9.3 °C, 2021 -1.1 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.1 °C * 08:54 10.1 °C 11.2 °C, 2012 -2.3 °C, 2017
Day Maximum (09-21) * 11.3 °C * 14:22 13.1 °C 14.6 °C, 2021 3.7 °C, 2020
Max 10m Temp Rise 0.2 °C 11:36 0.3 °C 0.6 °C, 2016 0.1 °C, 2010
Max 1hr Temp Rise 0.7 °C 22:12 0.9 °C 2.3 °C, 2017 0.4 °C, 2010
Max 1hr Hum Rise 8% 01:02 5% 9%, 2023 0%, 2010
Max 10m Temp Fall 0.4 °C 06:03 0.3 °C 1.7 °C, 2023 0.1 °C, 2009
Max 1hr Temp Fall 1.4 °C 06:29 1.0 °C 2.9 °C, 2023 0.3 °C, 2009
Max 1hr Hum Fall 5% 12:36 5% 11%, 2021 0%, 2010
Max 10m Wind Speed 12.0 mph 23:25 13.2 mph 15.3 mph, 2022 3.4 mph, 2016
Minimum Feels-like 6.5 °C 20:13 8.2 °C 6.5 °C, 2015 -5.1 °C, 2014
Maximum Feels-like 12.8 °C 04:50 14.7 °C 17.3 °C, 2021 3.1 °C, 2009
Mean Feels-like 11.1 °C 12.0 °C 11.5 °C, 2021 -1.0 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 7 hrs, 2014 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.7 °C (-1.7) 3.9 °C (-0.7) 10.2 °C (+5.8), 2017 1.7 °C (-2.8), 2010
Humidity Range 15% 17% 24%, 2017 0%, 2010
Pressure Range 10 hPa 8 hPa 17 hPa, 2017 3 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [50%]33 hrs (55%) [16%] 7 [100%], 2013 0 [0%], 2009
Wet Hours 4
[Mean rain rate: 0.7 mm/h]		68 hrs (117%) [9.7%] 11, 2009 0, 2013
Cloud Cover Partly Cloudy or Mostly Sunny
Events None
Comments o.night, am Showers
Extra Comments
Issues -09 internet outage
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 29th December 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