Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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January 2021: It was a colder and wetter than average month.
The average temperature of 4.9C was the coldest since 4.8C was recorded in 2011. This was -0.8C below the 30 year average (1991-2020). This was reflected in the average minimum and average maximum temperatures for the month. With regard to the average minimum temperatures of 2.3C it was the coldest since 0.0C was recorded in January 2010. With regard to the average maximum temperature of 7.4C it was the lowest since 7.2C in January 2013.

The total rainfall for the month was 115.2 mm which was 121.6% above the 30 year average (1991-2020). It was the wettest January since 2014
when 183.8 mm was recorded. The 2014 rainfall figure was the wettest on record for the month from continuous data starting in 1883.

The highest daily maximum temperature of 14.3C on 14th was the highest since 14.4C was recorded on 24th January 2016. It was also the 3rd highest
since records began in 1938. By way of contrast the -0.2C lowest daily average temperature on the 7th of the month was the lowest since -0.4 was recorded
on the 20th in 2013 and the lowest of any day since 1st March 2018.

Annual 2020: In 130 complete years of Bristol's annual average temperatures in 2020 it was the 2nd warmest with an average temperature of 12.4C. The warmest was in 2014 at 12.5C.
The annual rainfall of 1090.2 mm for 2020 was 123% of the 30 year average for the city of 889.9 mm. As the next 30 year average is prepared (1991-2020) 1090.2 mm represents 117% of the new average rainfall as this is increasing.
The average annual 24 hour maximum rainfall of 21.0 mm in 2020 was the highest since 23.1 mm in 2012 which was the wettest year on record for Bristol.
In 2020 48% of all the wind directions were from the SW or WSW. With much less frequencies Southerlies and North Easterlies were next.
Annual average pressure of 1014 mb, equal with last year, was lowest since 1012 mb in 2014.
2020 was the sunniest complete year of data, at 42.5% of the maximum, with regard to Wm2, since this parameter started in 2006.
In 2020 there were only 1 day when snowfall was observed to fall and none had any snow lying at 09:00 hours.
There were 10 days when thunder was heard and there were 7 days when a temperature of below 0.0C was recorded in 2020.

The 2020 Annual summary is here: http://www.bristolweather.org/weather2020annual.htm

For the full monthly summary please go here: http://www.bristolweather.org/weather2020January.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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