September 2024: It
was the wettest September since 1935 when 195.8 mm was recorded. It was the
5th wettest since records began in Bristol in 1853, (with 10 early years
missing), 172 years ago. The wettest was 258.3 mm in 1918 which is also the
wettest of any month in Bristol. The 187.7 mm in 2024 is 295.1% of the 30
year average (1991-2020).
The average
temperature of 15.3°C was 0.2°C below the 30 year average of 15.5°C. It was
3.1°C below last September's record average temperature. The average maximum
temperature for the month of 18.6°C was 0.8°C below the 30 year average and,
equal with 2019, was the lowest since 18.5°C recorded in 2012.
It was the dullest September since records began in 2005, except for 2011
when there was an obstruction. The maximum percentage of the actual sunshine
was a low 34.6% when the average is 43.7%. Winds were light and mainly from
a north easterly direction. The lowest pressure for the month of 983.6 mb on
the 26th was the 2nd lowest for a September since 2005 when the data
started.
The highest maximum daily temperature of 23.2°C on 1st of September was the
lowest since 2017 when 21.3°C was recorded. The lowest daily mean of
10.7°C recorded on the 13th was the lowest since 9.7°C in 2012.
Summer 2024: It was
the coolest summer since 2015. It was still the joint 34th warmest, with
1921, in 134 years of complete data for the city of Bristol. With an average
temperature of 17.4°C it was 0.3°C below the 30 year average (1991-2020) of
17.7°C. The average maximum temperature of the summer of 21.4°C was 0.5°C
below the 30 year average. The average minimum temperature of 13.7°C was
0.1°C above the average temperature.
The summer rainfall was below average with 139.5 mm for the 3 month total.
It was the 24th driest in 143 years of data. The 30 year average summer
rainfall is 212.7 mm so 2024 was 66% of the average.
Annual 2023:
The The annual rainfall for Bristol in 2023 was 1247.6 mm This makes it the
2nd wettest year since this data started in 1853 for the city.
The wettest year was 1315.4 mm in 2012. The 30 year average for the city is
913.8 mm so 2023 represents 137% of the average
The annual average temperature for 2023 was 12.6°C. That was the second
warmest. 2022, with an annual average temperature of 12.7°C, was the warmest
since continuous records started in 1891. The 30 year average temperature
(1991-2020) for the city was 11.6°.
To
view a full report of the Bristol Annual Weather 2022 and a discussion of trends
etc click here. This is a Word created .doc document
which is produced annually for a couple of Bristol Naturalist Society
publications. Please acknowledge the source if quoting any of the contents.
Thank you.
The
2023 Annual summary is here:
http://www.bristolweather.org/weather2023annual.htm
For the full monthly summary please go here:
http://www.bristolweather.org/weather2024
September.htm
The
Meteorological site is situated in an urban housing area approximately one
mile to the south of the Centre of Bristol.
This area is in a district called Totterdown.
Statistical correlations with the Bristol
Meteorological Office site, that was
less than two miles to the North and was
situated on top of a City Centre office block, were generally good with
rainfall and barometric data particularly close.
The site of the station is approximately 34 metres above sea level with the
manual instruments mounted in a Stevenson screen. The screen is sited
centrally in a small concreted garden area. A Snowdon
rain gauge is mounted correctly in the ground but does not have the full open
space required around it. A Davis
Vantage Pro2 Plus automatic weather station (AWS) was
added in May 2005 and this is mounted 4 feet above a concrete shelter. The
wind data is gathered automatically from a Davis Vantage Pro2 Plus anemometer which is
sited 3.3 metres (10 feet) above the house top.
Manual observations are still taken at approximately 09:00 hours GMT every
day for rainfall and cloud cover. Rainfall manually recorded in the Snowdon rain gauge is entered for the previous day. The
wind data is constantly logged and automatically reset at 24:00 hours GMT
every day (in the summer BST -1 hour. The Davis rainfall tipping bucket was recalibrated in November 2005 and is now
consistently under 3% under recording (an improvement from installation in
May 2005 when 10% was more
typically the norm).
Since the arrival of the Davis
Vantage Pro2 Plus equipment in May 2005 temperatures, humidity and barometric
pressure are recorded from the new equipment. These figures will be more
accurate and will be taken at exactly 09:00 GMT (in the summer BST -1 hour)
as the data is now logged to a computer.
By default the Davis
equipment records every parameter for the 24 hour period 00:00 to 23:59 BST
or GMT. Data analysis will enable manual data extraction of temperatures and
rainfall to 09:00 GMT (adjusted in the summer). Due to the 0.2 mm (tipping
bucket) measurements of precipitation recorded by the Davis equipment the
Snowdon rain gauge will still be used due to its greater accuracy (see
above).