Bristol Weather Station

Totterdown, Bristol, UK.

http://www.bristolweather.org

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

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April; 2018: April 2017 in Bristol was the wettest since April 2012 which was the wettest on record. The 78.7 mm of rain in 2018 represents
140.8% of the 30 year average.
It was a warmer than average April mainly due to the high minimum temperatures. The average temperature of 11.3C was 1.2C above the average.
The average minimum temperature of 8.3C was the highest since 8.7C was recorded in 2011.
It was the dullest April, with only 41.3% of the maximum sunshine, since 2012 which had only 39.2%. April 2018 is the second dullest since
this data started in 2006.
The monthly average pressure of 1010mb was the lowest since 2001mb was recorded in April 2012

The 24 hour daily maximum rainfall of 23.7mm on the 1at was the wettest for April since 24.0mm was recorded on 30th April 2002.
The highest daily minimum temperature of 13.2C recorded on the 22nd was the highest since 14.3C was recorded on the 29th April 1994.
The highest daily maximum temperature of 24.8C recorded on the 21st was the highest April temperature since 26.2C was recorded
on the 21st April 2011.

Annual 2017: The annual average temperature of 12.1C in 2018 was 0.8C above the 30 year average for Bristol. This makes 2017 the 3rd warmest year (equal with 1989, 1990 and 1997). Continuous records for average temperature having been found since 1891 in Bristol.

The Total rainfall for 2017 was 751.0 mm. This is 138.9 mm less than the 30 year average for Bristol and the driest year since 2011 when only
723.1 mm was recorded. 2017 was the 39th direst year in Bristol in 165 years of continuous annual data for the city.

It was the dullest year on record since this data started in 2005 with a annual average 0f 37.7% of maximum sunshine. The average is 40.0%..

The 2017 Annual summary is here: http://www.bristolweather.org/weather2017annual.htm

For the full monthly summary please go here: http://www.bristolweather.org/weather2018apr.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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