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The basic climate of the UK annually is wet and cool in winter, spring, and fall with frequent cloudy skies, and drier and cool to mild in summer. The climate in the United Kingdom is defined as a humid temperate oceanic climate , or Cfb on the Köppen climate classification system, a classification it shares with most of north-west Europe. [ 1 ]
The driest thirty-six consecutive months are from August 1853 to July 1856 with an annual average of 750.8 millimetres (29.56 in), very closely followed by October 1783 to September 1786 with an annual average of 751.2 millimetres (29.57 in), and April 1805 to March 1808 averaging 760.4 millimetres (29.94 in) per annum.
The uplands of Wales have most rain, normally more than 50 days of rain during the winter months (December to February), falling to around 35 rainy days during the summer months (June to August). Annual rainfall in Snowdonia averages between 3,000 millimetres (120 in) (Blaenau Ffestiniog) and 5,000 millimetres (200 in) (Snowdon's summit). [3]
Highest 24-hour total (UK national average) 31.7 mm (1.25 in) UK (national average) [9] 3 October 2020 Highest 48-hour total 405 mm (15.9 in) Thirlmere, Cumbria 4 to 5 December 2015 Highest 72-hour total 456.4 mm (17.97 in) Seathwaite, Cumbria 17 to 19 November 2009 Highest 96-hour total 495 mm (19.5 in) Seathwaite, Cumbria
Rain forests are characterized by high rainfall, with definitions setting minimum normal annual rainfall between 1,750 and 2,000 mm (69 and 79 in). [102] A tropical savanna is a grassland biome located in semi-arid to semi-humid climate regions of subtropical and tropical latitudes, with rainfall between 750 and 1,270 mm (30 and 50 in) a year.
Average annual rainfall varies from over 3,000 mm (118.1 in) in the Scottish Highlands down to 553 mm (21.8 in) in Cambridge. The county of Essex is one of the driest in the UK, with an average annual rainfall of around 600 mm (23.6 in), although it typically rains on over 100 days per year.
The project involved the transcription of 130 years worth of handwritten rainfall records – more than five million individual observations.
This is a list of countries by average annual precipitation. List. Per the World Bank (2017) [1] [2] Country mm/ year) Continent 1