Daily Report for 13th July 2018

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	16.0 °C (+1.8)	05:58	15.2 °C (+1.5)	18.7 °C (+4.5), 2022	11.8 °C (-2.4), 2016
Maximum Temperature	26.2 °C (+3.1)	17:26	27.2 °C (+4.5)	30.3 °C (+7.2), 2013	17.2 °C (-5.9), 2011
Mean Temperature	19.8 °C (+2.5)		21.2 °C (+3.0)	24.2 °C, 2022	14.6 °C, 2011
Minimum Humidity	43%	16:21	39%	78%, 2015	32%, 2020
Maximum Humidity	90%	21:01	84%	96%, 2012	77%, 2017
Mean Humidity	72%		62%	87%, 2015	54%, 2017
Minimum Pressure	1021 hPa	17:40	1019 hPa	1023 hPa, 2013	1000 hPa, 2012
Maximum Pressure	1024 hPa	08:42	1023 hPa	1028 hPa, 2020	1006 hPa, 2012
Mean Pressure	1023 hPa		1021 hPa	1024 hPa, 2013	1002 hPa, 2012
Mean Wind Speed	2.8 mph (-1.5)		3.2 mph (-1.1)	7.8 mph, 2026	1.6 mph, 2024
Maximum Wind Speed	9.3 mph	18:42	10.6 mph	16.9 mph, 2016	7.7 mph, 2019
Maximum Gust	13.8 mph	18:40	15.9 mph	26.5 mph, 2026	12.6 mph, 2017
Mean Wind Direction	n/a		E	NNW, 2022	N, 2011
Rainfall	16.9 mm		18.4 mm (95%)	16.9 mm, 2018	0.0 mm, 2011
Maximum Hourly Rain	13.4 mm	20:18	1.1 mm	13.4 mm, 2018	0.0 mm, 2021
Maximum 10-min Rain	4.8 mm	19:28	0.4 mm	4.8 mm, 2018	0.2 mm, 2015
Maximum Rain Rate	40 mm/h	19:20	3.4 mm/h	40 mm/h, 2018	0.4 mm/h, 2015
Minimum Dew Point	11.6 °C	15:41	10.2 °C	14.6 °C, 2015	5.1 °C, 2011
Maximum Dew Point	17.0 °C	20:20	15.3 °C	17.9 °C, 2013	10.1 °C, 2011
Mean Dew Point	14.1 °C		12.8 °C	15.6 °C, 2015	7.8 °C, 2011
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	16.0 °C	05:59	15.2 °C	20.9 °C, 2022	11.8 °C, 2016
Day Maximum (09-21)	26.2 °C	17:27	27.2 °C	30.3 °C, 2013	17.2 °C, 2011
Max 10m Temp Rise	0.6 °C	11:15	0.6 °C	0.8 °C, 2026	0.3 °C, 2015
Max 1hr Temp Rise	2.2 °C	12:03	2.6 °C	3.5 °C, 2013	1.0 °C, 2015
Max 1hr Hum Rise	28%	20:00	14%	28%, 2018	4%, 2015
Max 10m Temp Fall	1.1 °C	19:34	0.6 °C	1.3 °C, 2016	0.1 °C, 2015
Max 1hr Temp Fall	3.9 °C	20:00	2.3 °C	3.9 °C, 2018	0.5 °C, 2015
Max 1hr Hum Fall	10%	10:03	12%	18%, 2012	6%, 2024
Max 10m Wind Speed	7.3 mph	18:44	7.9 mph	13.6 mph, 2016	5.7 mph, 2013
Minimum Feels-like	19.2 °C	05:56	17.4 °C	23.0 °C, 2022	12.6 °C, 2017
Maximum Feels-like	29.2 °C	17:32	30.2 °C	34.4 °C, 2013	17.3 °C, 2011
Mean Feels-like	23.2 °C		24.0 °C	28.5 °C, 2022	15.1 °C, 2011
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	2.7 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	11.9 µg/m³, 2026	11.9 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	8.0 µg/m³, 2026	8.0 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	10.2 °C (+1.3)		12.0 °C	15.6 °C, 2013	3.6 °C, 2015
Humidity Range	47%		45%	53%, 2020	13%, 2015
Pressure Range	3 hPa		3 hPa	8 hPa, 2020	2 hPa, 2022

Observation	Detail
Sun Hours	8 hrs [54%]
Wet Hours	3 hrs
Cloud Cover	am: Overcast transitioned to Sunny pm: Mostly Sunny
Events	Light Thunderstorm
Comments	eve T-S w H Rn
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	0.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 13th July 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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