Daily Report for 10th August 2019

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	16.4 °C (+2.0)	23:56	15.6 °C (+1.1)	18.8 °C (+4.4), 2020	9.2 °C (-5.2), 2011
Maximum Temperature	21.8 °C (-1.1)	14:08	24.2 °C (+1.1)	33.7 °C (+10.8), 2020	19.1 °C (-3.8), 2010
Mean Temperature	18.6 °C (+0.5)		19.7 °C (+1.1)	25.9 °C, 2020	14.7 °C, 2018
Minimum Humidity	62%	14:10	54%	69%, 2010	35%, 2026
Maximum Humidity	90%	02:45	89%	96%, 2023	71%, 2013
Mean Humidity	76%		74%	86%, 2010	53%, 2013
Minimum Pressure	998 hPa	02:16	1009 hPa	1027 hPa, 2025	992 hPa, 2014
Maximum Pressure	1012 hPa	23:56	1014 hPa	1030 hPa, 2025	1007 hPa, 2014
Mean Pressure	1005 hPa		1012 hPa	1028 hPa, 2025	999 hPa, 2014
Mean Wind Speed	12.3 mph (+8.3)		5.7 mph (+1.7)	12.3 mph, 2019	1.7 mph, 2025
Maximum Wind Speed	26.2 mph	12:33	14.0 mph	26.2 mph, 2019	6.9 mph, 2012
Maximum Gust	48.4 mph	10:07	23.4 mph	48.4 mph, 2019	9.7 mph, 2012
Mean Wind Direction	n/a		S	NW, 2016	N, 2012
Rainfall	1.3 mm		10.1 mm (58%)	26.9 mm, 2014	0.0 mm, 2009
Maximum Hourly Rain	0.9 mm	15:16	0.8 mm	23.3 mm, 2014	0.2 mm, 2021
Maximum 10-min Rain	0.9 mm	15:16	0.7 mm	8.9 mm, 2014	0.2 mm, 2021
Maximum Rain Rate	7 mm/h	15:09	10 mm/h	119 mm/h, 2018	7 mm/h, 2019
Minimum Dew Point	12.5 °C	23:40	12.9 °C	16.2 °C, 2020	4.3 °C, 2016
Maximum Dew Point	16.0 °C	15:31	16.7 °C	20.7 °C, 2020	9.8 °C, 2013
Mean Dew Point	14.1 °C		14.6 °C	18.4 °C, 2020	6.9 °C, 2016
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	16.9 °C	03:55	15.7 °C	18.8 °C, 2020	9.2 °C, 2011
Day Maximum (09-21)	21.8 °C	14:08	24.2 °C	33.7 °C, 2020	19.1 °C, 2010
Max 10m Temp Rise	0.5 °C	10:54	0.7 °C	0.9 °C, 2011	0.4 °C, 2010
Max 1hr Temp Rise	1.9 °C	11:40	2.4 °C	4.8 °C, 2025	1.4 °C, 2010
Max 1hr Hum Rise	18%	15:27	14%	28%, 2026	5%, 2024
Max 10m Temp Fall	1.4 °C	15:18	0.8 °C	1.7 °C, 2014	0.3 °C, 2024
Max 1hr Temp Fall	2.6 °C	15:24	2.2 °C	3.6 °C, 2026	1.0 °C, 2015
Max 1hr Hum Fall	12%	16:27	12%	22%, 2018	6%, 2024
Max 10m Wind Speed	18.0 mph	11:59	10.6 mph	18.0 mph, 2019	4.9 mph, 2012
Minimum Feels-like	19.0 °C	23:50	18.5 °C	23.5 °C, 2020	9.2 °C, 2011
Maximum Feels-like	25.4 °C	13:59	28.3 °C	40.7 °C, 2020	20.2 °C, 2016
Mean Feels-like	22.0 °C		23.4 °C	32.2 °C, 2020	15.5 °C, 2016
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	1.5 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	15.6 µg/m³, 2026	15.6 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	5.8 µg/m³, 2026	5.8 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	5.4 °C (-3.1)		8.6 °C	15.5 °C, 2025	4.1 °C, 2010
Humidity Range	28%		35%	53%, 2012	15%, 2015
Pressure Range	13 hPa		5 hPa	15 hPa, 2014	2 hPa, 2013

Observation	Detail
Sun Hours	3.5 hrs [26%]
Wet Hours	2 hrs
Cloud Cover	Partly Cloudy or Mostly Cloudy
Events	None
Comments	02? 15 Shs
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	20.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 10th August 2019. Times of extremes use the midpoint of the longest continuous period at that value. Cumulative anomalies are relative to the expected value for the month-to-date. Sun and wet hours are derived from webcam/rainfall analysis and may be adjusted. Data should be viewed with appropriate caution.

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Daily Graph of Conditions

Wind direction

Air pollution

Wind rose

Webcam Summary of Cloud Conditions

Full resolution images at up-to 5 minute intervals