January 2025: The
average temperature in Bristol for January 2025 of 5.5°C was 0.2°C below the
30 year average for the city of 5.7°C. The minimum temperature of 2.5°C for
the month was 0.8°C below the 30 year average and the average maximum
temperature of 8.5°C was 0.4°C above the 30 year average. The rainfall for
the month of 106.2 mm was 112% of the 30 year average for the month of 94.7
mm.
Despite two named
storms in January resulting in winds gust of 46 mph and 45 mph on two
different days it was a relatively low wind speed month. As usual the main
wind speed direction was from the SW/WSW direction. This accounted for 41.9%
of the month's wind direction. The highest one hour maximum solar radiation
on the 30th January 2025 of 310.20 Wm/2 was the second highest value for a
January since this data started at this site in 2006.
Autumn 2024: With
respect to the autumn season, (September - November), it was the 4th wettest
on record in 143 years of data for Bristol. It was the 8th warmest
autumn on record in 134 years of data. The mean temperature was 12.6°C which
was 0.6°C above the 30 year average of 12.0°C.
With a total rainfall of 430.3 mm in the autumn of 2024 it was 166% above
the 30 year average of 258.8 mm. The previous wetter autumn was in 2000
when 487.4 mm was recorded.
Annual 2024:
The annual rainfall for Bristol in 2024 was 1153.4 mm this makes it the 10th
wettest year since this data started in 1853. The wettest year was 2012 with
1315.4 mm. The 30 year average for the city is 913.8 mm so 2024 represents
126% of the average. The annual average temperature for 2024 was 12.4°C.
That made it the equal 4th warmest with 2020, and 0.8°C above the 30 year
average of 11.6°C. Continuous average temperatures for Bristol started in
1891. It was the dullest year from records starting in 2005 with only 37% of
the maximum sunshine recorded.
To
view a full report of the Bristol Annual Weather report 2023 and a discussion of trends
etc click here. This is a Word created .doc document
which is produced annually for a Bristol Naturalist Society
publication. Please acknowledge the source if quoting any of the contents.
Thank you.
The
2024 Annual summary is here:
http://www.bristolweather.org/weather2024annual.htm
For the full monthly summary please go here:
http://www.bristolweather.org/weather2025
January.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).