Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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January 2023: January 2023 was very clearly split into two halves. From the 1st to the 15th the weather was vey wet and mild. In the second half it was much dryer and colder until the last week when temperatures recovered. The consequence of this was for the monthly average temperature of 6.3C came out at a very modest 0.6C above the average for the month. Rainfall for the month, despite the dry last two weeks, on the other hand was still high at 146.3 mm (154.5% of the 30 year average 1991-2020). It was the wettest January since 2014 and continues a slightly rising January rainfall over the historical period starting in 1853.

There was no snowfall in January 2023 but there were 9 consecutive days when frost was recorded. There were 71 hours when the temperature was below 0.0C in the month and this is the highest in January since this data started in 2016.
It was the sunniest January since records began in 2006 with 24.8% of the maximum. The average for January is 20.2%.
Nearly 60% of the wind direction was from a south west or west south westerly direction despite the cold snap in the month which mainly saw calm days.

January 11th 2023 saw a 24 hour rainfall of 43.2mm. This was the second highest for the month. The highest was 52.0mm in January 1926 with data starting in 1893. The lowest daily maximum temperature of 1.1C on the 21st was the lowest for the month since 0.2C in January 2013 The lowest daily mean temperature of -0.7C also on the 21st was the lowest for January since 2010.

Autumn 2022 With respect to the autumn season September - November it was mild and wet. The mean temperature was 13.7C which made 2022 the joint warmest autumn, with 2011, in 132 years. The 30 year average for the season in Bristol is 12.0C. With a total rainfall of 328.9mm in the autumn of 2022 it was  24th wettest in 141 years of continuous data for city. The 30 year average for the season is 258.8 mm so 2022 had an excess above average of 70.1mm.

Annual 2022: In 132 complete years of Bristol's average temperatures, in 2022 it was the warmest at 12.7C. The previous warmest was 2014 when the average temperature reached 12.5C. 2022 was 1.1C above the 30 year average (1991-2020) of 11.6C. August was the hottest month with an average temperature of 20.8C.

The annual rainfall of 798.4 mm for 2022 was 87.4% of the 30 year average (1991-2020) for the city of 913.8 mm. The wettest month was November with
157.7 mm (157.0% above the 30 year average 1990-2020) of rainfall whilst the driest was July with only 17.5 mm of rain. There was measurable rainfall during the year for 4.2% of the time (371 hours). The first 9 months of 2022 produced 407.6 mm or rain whilst the last three months of the year produced 390.8 mm.

2022 was the least windy year with an average wind speed of 4.2 mph since records began in 2005. The average for the whole period is 5.4 mph. Notable was the increase of 'calm' days in 2022 when the wind speed is less than 0.5 mph throughout the day. The average (2005-2022) 1.4% calm days but in 2022 this was 7.1%. There were 20 days of air frost, 3 days, 1 with two occurrences, of thunderstorms and 3 days of small hail recorded. There was 1 day of snowfall which was lying for 1 day at 09:00 GMT. It was very close to the average for the percentage of maximum sunshine. In 2022 this was 40.7% when the annual average is 40.2%. The maximum daily temperature of 36.9C on the 18th July was the highest recorded for Bristol. The lowest temperature of 2022 at -5.8C recorded on 15th & 16th December was the lowest of any month since February 2012.

To view a full report of the Bristol Annual Weather 2021 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 2022 Annual summary is here: http://www.bristolweather.org/weather2022annual.htm

For the full monthly summary please go here: http://www.bristolweather.org/weather2023 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).

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