Daily Report for 4th July 2018

Measure	Value (anomaly)	Time	Month cumul.	Record High	Record Low
Minimum Temperature	13.2 °C (-0.2)	04:43	15.0 °C (+1.7)	17.6 °C (+4.2), 2015	10.6 °C (-2.8), 2019
Maximum Temperature	25.7 °C (+3.2)	14:15	27.3 °C (+4.9)	28.3 °C (+5.8), 2026	19.1 °C (-3.4), 2023
Mean Temperature	19.6 °C (+1.5)		21.3 °C (+3.3)	21.9 °C, 2026	15.3 °C, 2023
Minimum Humidity	45%	14:14	35%	79%, 2020	27%, 2025
Maximum Humidity	86%	23:16	76%	96%, 2012	66%, 2011
Mean Humidity	67%		54%	86%, 2020	47%, 2011
Minimum Pressure	1014 hPa	16:46	1015 hPa	1025 hPa, 2026	1003 hPa, 2014
Maximum Pressure	1019 hPa	01:06	1018 hPa	1030 hPa, 2025	1012 hPa, 2024
Mean Pressure	1016 hPa		1017 hPa	1027 hPa, 2026	1008 hPa, 2014
Mean Wind Speed	3.0 mph (-1.3)		5.1 mph (+0.8)	9.3 mph, 2020	1.5 mph, 2019
Maximum Wind Speed	9.0 mph	08:27	12.3 mph	17.6 mph, 2016	7.1 mph, 2019
Maximum Gust	11.5 mph	02:10	17.6 mph	30.0 mph, 2020	10.4 mph, 2019
Mean Wind Direction	n/a		ENE	NW, 2026	NE, 2019
Rainfall	1.5 mm		1.5 mm (25%)	9.5 mm, 2012	0.0 mm, 2009
Maximum Hourly Rain	1.3 mm	22:41	0.3 mm	3.1 mm, 2023	0.5 mm, 2021
Maximum 10-min Rain	0.7 mm	22:38	0.2 mm	2.3 mm, 2015	0.3 mm, 2020
Maximum Rain Rate	4.4 mm/h	22:38	1.1 mm/h	72 mm/h, 2015	1.0 mm/h, 2020
Minimum Dew Point	10.5 °C	11:18	8.4 °C	14.5 °C, 2012	5.9 °C, 2014
Maximum Dew Point	16.5 °C	23:00	13.6 °C	18.4 °C, 2015	9.8 °C, 2011
Mean Dew Point	12.9 °C		10.9 °C	15.7 °C, 2012	8.1 °C, 2011
Measure	Value	Time	Month cumul.	Record High	Record Low
Night Minimum (21-09)	13.2 °C	04:46	15.0 °C	17.6 °C, 2015	10.6 °C, 2019
Day Maximum (09-21)	25.7 °C	14:24	27.3 °C	28.3 °C, 2026	19.1 °C, 2023
Max 10m Temp Rise	0.8 °C	12:52	0.7 °C	1.0 °C, 2009	0.4 °C, 2015
Max 1hr Temp Rise	2.3 °C	10:30	2.6 °C	3.7 °C, 2025	1.5 °C, 2023
Max 1hr Hum Rise	19%	21:52	12%	19%, 2018	5%, 2012
Max 10m Temp Fall	0.5 °C	14:51	0.5 °C	0.9 °C, 2022	0.3 °C, 2012
Max 1hr Temp Fall	2.0 °C	22:16	1.8 °C	2.5 °C, 2014	0.8 °C, 2012
Max 1hr Hum Fall	12%	11:11	12%	20%, 2015	6%, 2020
Max 10m Wind Speed	5.9 mph	18:43	9.1 mph	14.5 mph, 2016	4.8 mph, 2019
Minimum Feels-like	14.8 °C	04:38	16.1 °C	19.9 °C, 2012	11.3 °C, 2019
Maximum Feels-like	29.3 °C	16:54	29.6 °C	33.1 °C, 2026	21.3 °C, 2023
Mean Feels-like	22.4 °C		23.1 °C	25.7 °C, 2026	17.5 °C, 2023
Air-frost Hrs	0 hrs		0 hrs	0 hrs, 2009	0 hrs, 2009
Minimum PM2.5	n/a		0.0 µg/m³	1.3 µg/m³, 2026	0.0 µg/m³, 2009
Maximum PM2.5	n/a		0.0 µg/m³	10.8 µg/m³, 2026	10.8 µg/m³, 2026
Mean PM2.5	n/a		0.0 µg/m³	4.1 µg/m³, 2026	4.1 µg/m³, 2026
Measure	Value (anomaly)		Month cumul.	Record High	Record Low
Temperature Range	12.5 °C (+3.4)		12.3 °C	16.0 °C, 2019	5.0 °C, 2020
Humidity Range	41%		40%	55%, 2019	14%, 2020
Pressure Range	5 hPa		3 hPa	11 hPa, 2014	2 hPa, 2009

Observation	Detail
Sun Hours	7 hrs [47%]
Wet Hours	1.5 hrs
Cloud Cover	am: Mostly Sunny pm: Partly Cloudy transitioned to Mostly Cloudy
Events	None
Comments	late eve Shs
Observer Absent?	Yes - observations may be unreliable
Pond Temperature	0.0 °C

Notes: Detailed daily weather report for Hampstead, NW3, London on 4th 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

Full resolution images at up-to 5 minute intervals