Daily Report for 16th September 2016

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	12.7 °C (+1.3)	23:36	15.1 °C (+2.9)	15.4 °C (+4.0), 2020	7.9 °C (-3.5), 2017
Maximum Temperature	19.4 °C (+0.7)	00:00	23.3 °C (+3.2)	26.1 °C (+7.4), 2023	14.2 °C (-4.5), 2013
Mean Temperature	16.3 °C (+1.0)		19.1 °C (+3.1)	20.4 °C, 2020	11.2 °C, 2013
Minimum Humidity	66%	18:26	59%	82%, 2015	40%, 2022
Maximum Humidity	93%	07:50	88%	98%, 2009	83%, 2020
Mean Humidity	83%		76%	91%, 2015	65%, 2013
Minimum Pressure	1008 hPa	21:22	1011 hPa	1027 hPa, 2024	985 hPa, 2015
Maximum Pressure	1016 hPa	22:29	1018 hPa	1033 hPa, 2024	996 hPa, 2015
Mean Pressure	1012 hPa		1015 hPa	1030 hPa, 2024	988 hPa, 2015
Mean Wind Speed	8.7 mph (+4.8)		5.5 mph (+1.6)	8.7 mph, 2016	1.5 mph, 2021
Maximum Wind Speed	19.2 mph	18:25	16.1 mph	19.2 mph, 2016	6.8 mph, 2019
Maximum Gust	30.6 mph	10:21	23.7 mph	30.6 mph, 2016	12.5 mph, 2014
Mean Wind Direction	n/a		SW	N, 2022	NNE, 2015
Rainfall	20.6 mm		34.0 mm (128%)	26.1 mm, 2015	0.0 mm, 2010
Maximum Hourly Rain	11.4 mm	05:07	1.0 mm	11.4 mm, 2016	0.2 mm, 2019
Maximum 10-min Rain	7.0 mm	04:33	0.6 mm	7.0 mm, 2016	0.2 mm, 2019
Maximum Rain Rate	120 mm/h	04:33	9 mm/h	120 mm/h, 2016	9 mm/h, 2013
Minimum Dew Point	9.8 °C	22:44	11.8 °C	12.3 °C, 2023	2.0 °C, 2022
Maximum Dew Point	16.3 °C	03:44	16.9 °C	18.0 °C, 2023	8.0 °C, 2022
Mean Dew Point	13.4 °C		14.7 °C	15.2 °C, 2020	4.7 °C, 2013
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	15.5 °C	08:37	15.6 °C	18.4 °C, 2020	7.9 °C, 2017
Day Maximum (09-21)	17.1 °C	17:55	23.1 °C	26.1 °C, 2023	14.2 °C, 2013
Max 10m Temp Rise	0.3 °C	13:12	0.6 °C	0.8 °C, 2021	0.2 °C, 2015
Max 1hr Temp Rise	1.0 °C	15:33	1.9 °C	3.8 °C, 2023	0.9 °C, 2010
Max 1hr Hum Rise	5%	00:59	9%	17%, 2020	5%, 2016
Max 10m Temp Fall	0.4 °C	04:53	0.5 °C	1.2 °C, 2013	0.2 °C, 2012
Max 1hr Temp Fall	1.2 °C	19:48	1.8 °C	2.8 °C, 2020	0.9 °C, 2012
Max 1hr Hum Fall	12%	18:01	12%	15%, 2013	4%, 2019
Max 10m Wind Speed	14.3 mph	23:16	12.2 mph	14.3 mph, 2016	4.3 mph, 2019
Minimum Feels-like	14.9 °C	23:24	18.0 °C	17.8 °C, 2020	4.9 °C, 2013
Maximum Feels-like	24.1 °C	23:57	27.9 °C	31.6 °C, 2023	14.3 °C, 2013
Mean Feels-like	19.4 °C		23.1 °C	24.5 °C, 2020	10.6 °C, 2013
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	0.0 µg/m³, 2009	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	n/a	n/a
Mean PM2.5	n/a		0.0 µg/m³	n/a	n/a
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	6.7 °C (-0.6)		8.2 °C	12.8 °C, 2023	4.2 °C, 2019
Humidity Range	27%		29%	50%, 2022	12%, 2015
Pressure Range	8 hPa		7 hPa	11 hPa, 2015	2 hPa, 2013

Observation	Detail
Sun Hours	0.4 hrs [4%]
Wet Hours	9 hrs
Cloud Cover	am: Overcast pm: Overcast transitioned to Partly Cloudy
Events	Light Thunderstorm
Comments	"am H Shs w T-storm"
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	0.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 16th September 2016. 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.

View monthly summary

Daily Report for 16th September 2016

Daily Graph of Conditions

Wind direction

Air pollution

Wind rose

Webcam Summary of Cloud Conditions