Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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October 2020: It was a dull and wet month with rainfall 164.7% above the 30 year average with a total of 163.1 mm. The previous wetter October was in 2000 when 194.2 mm was recorded. Temperatures were close to the 30 year average with a mean of 11.8C but the average max temperature was -0.4C below average while the average min temperature was 0.5C above the average.

October 2020 was the 2nd dullest since this data started in 2005 with only 29.6% of the maximum sunshine. The only previously duller October was
2011 with only 28.3% of the maximum sunshine. The average pressure at 09:00 GMT was 1007mb and is the joint lowest for October since records began in 1995. The joint lowest month was in 2004.

the 24 hour maximum rainfall of 37.1mm on the 3rd was the highest 24 hour rainfall since 41.5mm was recorded on 19th October 2001. The highest daily maximum temperature of 17.5C on the 20th was the lowest for October since 16.8C was the maximum on 1st October 1998. The maximum hourly surface energy of 9.74 MJ/m2 on the 6th of October was the lowest since this data started in 2005. The highest daily mean temperature of 14.7C on 31st was the lowest since October 2nd 2000..

Summer 2020: The summer of 2020 was the 12th wettest in 139 years of data for Bristol with a total of 311.3 mm when the long term average is 201.9 mm.
It was also the 17th warmest summer in 130 years of data. At 17.8C it was 1.3C above the long term average of 16.5C.

The 2019 Annual summary is here: http://www.bristolweather.org/weather2019annual.htm

For the full monthly summary please go here: http://www.bristolweather.org/weather2020October.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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