Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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December 2021: The average temperature of 8.3C was 2.2C warmer than the 30 year average for the month and was the largest positive monthly anomaly of 2021.
The average minimum temperature for December was, at 6.2C was higher than the November minimum temperature of 5.7C.
Rainfall at 78.4 mm was 77% of the 30 year average for the month. It was the driest December since 2016 when only 30.3 mm was recorded.
It was the dullest December with 17.4% of the maximum possible solar radiation since 2015. Rainfall at 110.3 mm was 114.7% of the 30 year average.
The average temperature of 7.3C was 1.4C above the 30 year average for the month.

The highest daily minimum temperature of 13.1C on the 31st was the highest since this data started for Bristol in 1960.
The highest daily mean temperature of 13.9C on the 31st was the joint highest, with 2015, since this data started in 1993.
The lowest minimum temperature of -0.7C for the month on the 27th was the highest since 4.9C was recorded on 25th December 2015.

Autumn 2021 With respect to the autumn season September - November the mean temperature was 13.2C. This makes 2021 the 4th warmest autumn in 131 years
of data for Bristol. The 30 year average for the season in Bristol is 12.0C. The warmest was in 2011 with an average temperature of 13.7C
With rainfall high in October and very low in November the autumn rainfall of 223.2 mm was 35 mm below the 30 year average.

Annual 2021: In 131 complete years of Bristol's average temperatures in 2021 it was the joint 10th warmest with (with 1999 & 2015) with an average temperature of 11.9C. The 2nd warmest month, after July, was September.
The annual rainfall of 891.1 mm for 2021 was 97.5% of the 30 year average (1991-2020) for the city of 913.8 mm. The wettest month was October with 145.6 mm (145.6%) of rainfall whilst the driest was November with only 14.1 mm (14.0%) of rain.
In 2021 the predominate wind direction was from the SW or WSW accounting for 42.7% of all the wind directions. The annual average pressure of 1017 mb
was the equal 3rd highest in 27 years of data at this site. It was the least windy year since data began in 2005 with regard to the average wind speed.
There were no wind gusts over 50 mph for the 1st time in 4 years. Thunder was only heard on 1 occasion. In 2021 there were only 4 occasions when snowfall was observed to fall and only 1 had any snow lying at 09:00 hours.

To view a full report of the Bristol Annual Weather 2020 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 2021 Annual summary is here: http://www.bristolweather.org/weather2021annual.htm

For the full monthly summary please go here: http://www.bristolweather.org/weather2021 December.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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