Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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August 2021: The average temperature was -0.8C the 30 year average for Bristol and was equal coolest at 17.3C with 2017 since 2015 with 17.2C.
The average maximum temperatures were 1.2C below the 30 year average (1991-2020) but average minimum temperatures were only 0.2C below.
It was the dullest August since 2015. The maximum percentage of sunshine in 2021 was 43.7%, 5% below the average 2005-21. There were an unusually high number of NE winds for the month.
The total monthly rainfall for August was 86.3mm which is 104% of the average for the month.

During the first week in August 2021 there were 4 spells of rain, totaling 7 hours, that delivered 44.8 mm of out of a total of 64.6 mm of rain for the week.
This is very unusual for this site in urban Bristol at any time of the year. The first spell was 14.6 mm between 15:20 & 17:20 on the 2nd of August.
The second spell was 12.4 mm between 18:50 & 20:50 on the 5th. The third spell was 7.4 mm between 13:40 & 14:40 and finally
the fourth spell was 10.4 mm between 03:20 & 04:20 all falling on the 7th.
The 28.9mm of rain recorded in the 24 hour period on the 7th August was the highest of any month since December 2020 when 29.5 mm was recorded.

The highest daily maximum temperature of 24.1C on the 14th was the lowest maximum for an August since 21.4C in 1993.
There was a large range of pressure as the maximum pressure at 09:00 GMT of 1030mb on the 31st was the highest in August since 2012, and the lowest pressure
for the month of 994 mb was the lowest since 992 mb in August 2014.

Summer 2021 It was the 17th warmest in 131 years of complete data for the city of Bristol without feeling spectacular. With an average temperature of 18.1C it was 0.4C above the 30 year average (1991-2020). The warmest summer was 1995 with an average temperature of 19.4C.  The coolest was the summer of 1954 when the average temperature on reached 14.4C.
It was the 26th warmest summer with respect to maximum temperatures at 22.0C out of 116 complete years of data. With respect to average
minimum temperatures. The summer of 2021 was the equal 4th warmest (with 1983) at 14.4

The summer rainfall total was 222.1 mm which is 10 mm above the 30 year average.

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.

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

For the full monthly summary please go here: http://www.bristolweather.org/weather2021August.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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