Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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March 2022: The March mean temperature at 9.5C was 1.5C above the 30 year average for the city. It was the 5th warmest, with 1957, 1997 and 2000, since data was recorded from 1853 (with 1890 missing). It was however the average maximum temperature that was the most notable for March 2022 as it was 2.2C above the 30 year average (1991-2020). With regard to average maximum temperatures it was the 4th warmest, after 2012, 2003 and 1948, since data started 122 years ago.
The month's total rainfall was 51.1 mm which is 84.3% of the 30 year average (1991-2020). Interestingly the first three months of 2022 have been the  driest since 2012 which in fact became the wettest year on record from data starting in 1853!
The March 2022 mean wind speed of 3.3 mph was the 2nd joint lowest wind speed for the month since data started in 2006. Also of note was the low incidents of South Westerly winds in March 2022 and in fact not since April 2019 have there been as few SW and more SE winds. The monthly solar radiation for March was 3.5% above the average for the month with regard to the maximum percentage possible at 45.1%. This was mainly due to a very sunny spell toward the end of the month.

The maximum wind gust of 32 mph on the 12th was the joint 2nd lowest (with 2001) since data started in 2006. The highest daily temperature of 20.3C on the 23rd of the month was the 10th highest in 86 years of data for Bristol. The highest pressure of the month of 1041.9 mb on the 18th was the highest March pressure for this site since data started in 1994.

Winter 2021/22 With an average winter temperature of 7.4C it was 5th warmest in Bristol in 132 years of data. It was 1.5C above the 30 year average for the city
The total rainfall for the 3 winter months was 189.7 mm. The 30 year average (1991-2020) for the city is 260.7mm. This total makes 2021/22 the 47th driest winter out of 141 in the city.

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/weather2022 March.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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