Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

For further information e-mail  Barry (change the "AT")

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May 2025: It was the warmest on record since continuous data started 135 years ago. With an average temperature of 16.0°C it was 2.3°C above the 30 year average for Bristol. The previous warmest May was in 1998 when the average temperature was 15.9°C. Average maximum temperatures were 3.2°C above the 30 year average, whilst average minimum temperatures were up by 1.6°C.
For the 4th consecutive month, rainfall was bellow average. At 26.7 mm it was only 42.8% of the 30 year average. It was the joint 19th driest month in 145 years of continuous data starting in 1881 and was the driest May since 2020. With 60.9% of the maximum sunshine recorded in May 2025, it was the third sunniest since data started in 2005. The sunniest was 2020 when the maximum sunshine percentage reached 74.2. Wind direction for the month was predominantly from a North Easterly direction.

The highest daily maximum temperature of 30.6°C on the 1st was the highest recorded for May since data started in 1938. The previous warmest May
day was in 2020 when 29.2°C was recorded..

Spring 2025: The spring of 2025 was warmest with respect to the average temperature since the data started for the city in 1891. With a mean temperature of 13.0°C it was 2.3°C above the 1990-2020 average. The spring rainfall of 2025 was the 5th driest out of 144 years of data with a total of 64.0 mm. This was 36% of the 30 year average of 179.5 mm. The direst spring was 1990 when only 50.2 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 May.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).

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