Daily Report for 10th August 2018

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	10.7 °C (-3.7)	06:01	15.2 °C (+0.7)	18.8 °C (+4.4), 2020	9.2 °C (-5.2), 2011
Maximum Temperature	19.4 °C (-3.5)	18:17	26.9 °C (+3.8)	33.7 °C (+10.8), 2020	19.1 °C (-3.8), 2010
Mean Temperature	14.7 °C (-3.6)		21.2 °C (+2.2)	25.9 °C, 2020	14.7 °C, 2018
Minimum Humidity	58%	18:24	43%	69%, 2010	35%, 2026
Maximum Humidity	94%	00:42	88%	96%, 2023	71%, 2013
Mean Humidity	81%		66%	86%, 2010	53%, 2013
Minimum Pressure	1015 hPa	13:36	1016 hPa	1027 hPa, 2025	992 hPa, 2014
Maximum Pressure	1022 hPa	23:49	1021 hPa	1030 hPa, 2025	1007 hPa, 2014
Mean Pressure	1019 hPa		1018 hPa	1028 hPa, 2025	999 hPa, 2014
Mean Wind Speed	4.4 mph (+0.4)		3.2 mph (-0.8)	12.3 mph, 2019	1.7 mph, 2025
Maximum Wind Speed	16.2 mph	18:33	11.2 mph	26.2 mph, 2019	6.9 mph, 2012
Maximum Gust	25.3 mph	13:41	17.9 mph	48.4 mph, 2019	9.7 mph, 2012
Mean Wind Direction	n/a		SSW	NW, 2016	N, 2012
Rainfall	7.5 mm		22.6 mm (130%)	26.9 mm, 2014	0.0 mm, 2009
Maximum Hourly Rain	3.7 mm	14:29	0.9 mm	23.3 mm, 2014	0.2 mm, 2021
Maximum 10-min Rain	3.3 mm	13:48	0.5 mm	8.9 mm, 2014	0.2 mm, 2021
Maximum Rain Rate	119 mm/h	13:47	16 mm/h	119 mm/h, 2018	7 mm/h, 2019
Minimum Dew Point	8.3 °C	22:04	11.3 °C	16.2 °C, 2020	4.3 °C, 2016
Maximum Dew Point	15.2 °C	16:45	16.5 °C	20.7 °C, 2020	9.8 °C, 2013
Mean Dew Point	11.3 °C		13.9 °C	18.4 °C, 2020	6.9 °C, 2016
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	10.7 °C	06:03	15.5 °C	18.8 °C, 2020	9.2 °C, 2011
Day Maximum (09-21)	19.4 °C	18:18	26.7 °C	33.7 °C, 2020	19.1 °C, 2010
Max 10m Temp Rise	0.7 °C	10:17	0.6 °C	0.9 °C, 2011	0.4 °C, 2010
Max 1hr Temp Rise	2.8 °C	07:56	2.8 °C	4.8 °C, 2025	1.4 °C, 2010
Max 1hr Hum Rise	20%	12:04	14%	28%, 2026	5%, 2024
Max 10m Temp Fall	1.2 °C	18:43	0.7 °C	1.7 °C, 2014	0.3 °C, 2024
Max 1hr Temp Fall	3.1 °C	19:28	2.7 °C	3.6 °C, 2026	1.0 °C, 2015
Max 1hr Hum Fall	22%	18:12	15%	22%, 2018	6%, 2024
Max 10m Wind Speed	11.3 mph	10:43	8.3 mph	18.0 mph, 2019	4.9 mph, 2012
Minimum Feels-like	11.7 °C	05:56	18.0 °C	23.5 °C, 2020	9.2 °C, 2011
Maximum Feels-like	22.4 °C	17:46	30.4 °C	40.7 °C, 2020	20.2 °C, 2016
Mean Feels-like	16.7 °C		24.6 °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	8.7 °C (+0.2)		11.7 °C	15.5 °C, 2025	4.1 °C, 2010
Humidity Range	36%		45%	53%, 2012	15%, 2015
Pressure Range	7 hPa		5 hPa	15 hPa, 2014	2 hPa, 2013

Observation	Detail
Sun Hours	6.2 hrs [45%]
Wet Hours	3 hrs
Cloud Cover	am: Sunny transitioned to Overcast pm: Partly Cloudy with periods of Mostly Sunny
Events	Light Thunderstorm
Comments	H Thundery day Shs
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	0.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 10th August 2018. 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

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