Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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January 2020: Most notable in January 2020 has been the warm temperatures and the sixth consecutive month of above average rainfall.
The average temperature of 7.4C was the warmest since 7.7C was recorded in 2008. This makes January 2020 the 8th equal warmest (with 1993) since continuous records began in 1891. It was a similar picture with the maximum and minimum average temperatures as one might expect: with maximum temperatures being the equal 7th highest and minimum temperatures being the 8th highest in over 100 years of data for Bristol.
The month also saw the highest pressure this site has observed since records began in 1994. At 1049 mb this was higher than the previous pressure high of 1044 mb recorded in January 2019.

Individual days also saw extremes of temperatures. The lowest daily maximum of 6.1C on the 28th was the 3rd highest since data started in 1960. The highest daily maximum temperature of 14.2C 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. The lowest daily mean temperature of 3.0C recorded this January was the highest for the month since 3.7C was recorded 30th January 2014.
 


Annual 2019: In 129 complete years of Bristol's average temperatures in 2019 it was the joint 5th warmest with (with 1999, 2002, 2003 & 2015)
with an average temperature of 11.9C.
The annual rainfall of 984.6 mm for 2019 was 106% of the 30 year average for the city of 889.9 mm. The first 7 months, January to July,
had a below average rainfall of 83%, whilst the last 5 months, August to December, had 139% of the 30 year average.

In 2019 49% of all the wind directions were from the SW or WSW. Annual average pressure of 1014 mb was lowest since 1012 mb in 2014.
2019 was the sunniest complete year of data, with regard to Wm2, since this parameter started in 2006. In terms of percentage of maximum sunshine it was the 5th sunniest at 40.7%, since 2010 when 41.2% was recorded.

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

For the full monthly summary please go here: http://www.bristolweather.org/weather2020Jan.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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