Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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November 2019: It was the 4th consecutive month with above average rainfall with 120.3 mm, which is 129.2% of the 30 year average.
It was a colder than average temperature for Bristol in November at 7.5C, which is -0.6C below the average. It was however only the coldest since 2016 when 7.2C was the average temperature for the month.
The average air pressure of 1000 mb in November was the joint equal lowest, with 2009, since this data started in 1995. There has only been one lower average pressure month which was February 2014 with 996 mb. The low pressure of 971.0 mb recorded on the 2nd of November was the lowest of any month since 963.7 was recorded on 18th November 2010. It was also 3rd lowest pressure of any month since the data started in 1994.
It was the dullest November, with 23.1% of maximum sunshine, since 2015 when the recorded sunshine was only 17.8% of the maximum.

The highest daily minimum temperature of 9.9C recorded on the 25th was the lowest for a November since 9.4C was recorded on 5th in 1993.
The 24 hour maximum rainfall of 29.1 mm on the 2nd of the month was the highest for November since 2012 when 39.8 mm was recorded on the 20th.
On the 14th of November around 07:30 hours, for approximately one hour, sleet and snow falling was observed. This is the fist time this has been observed
in November at this site, since 30th November 2010. It is the earliest winter snowfall since data collection in 1995.

Autumn 2019: It was the 7th wettest autumn (September - November) since records began in 1882, which is 138 years of data, with a total of 388.3 mm.
The autumn of 2000 was the previous wettest with 487.4 mm. The 2019 figure represents 148% of the 30 year average (126.4 mm more).
Autumn 2019 was the coolest since 2012 but it was still the 29th warmest in 129 years of continuous data for the city.

The 2018 Annual summary is here: http://www.bristolweather.org/weather2018annual.htm

For the full monthly summary please go here: http://www.bristolweather.org/weather2019nov.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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