The climate is oceanic , milder than most places in England and United Kingdom. Located in southern England, Bristol is one of the warmest cities in the UK with a mean annual temperature of approximately 10.5 °C (50.9 °F). It is among the sunniest, with 1,541–1,885 hours of sunshine per year. Although the city is partially sheltered by the Mendip Hills, it is exposed to the Severn Estuary and the Bristol Channel. Annual rainfall increases from north to south, with totals north of the Avon in the 600–900 mm (24–35 in) range and 900–1,200 mm (35–47 in) south of the river. Rain is fairly evenly distributed throughout the year, with autumn and winter the wetter seasons. The Atlantic Ocean influences Bristol’s weather, keeping its average temperature above freezing throughout the year, but winter frosts are frequent and snow occasionally falls from early November to late April. Summers are warm and drier, with variable sunshine, rain and clouds, and spring weather is unsettled.
The weather stations nearest Bristol for which long-term climate data are available are Long Ashton (about 5 miles (8 km) south west of the city centre) and Bristol Weather Station, in the city centre. Data collection at these locations ended in 2002 and 2001, respectively, and Filton Airfield is currently the nearest weather station to the city. Temperatures at Long Ashton from 1959 to 2002 ranged from 33.5 °C (92.3 °F) in July 1976 to −14.4 °C (6.1 °F) in January 1982. Monthly high temperatures since 2002 at Filton exceeding those recorded at Long Ashton include 25.7 °C (78.3 °F) in April 2003, 34.5 °C (94.1 °F) in July 2006 and 26.8 °C (80.2 °F) in October 2011. The lowest recent temperature at Filton was −10.1 °C (13.8 °F) in December 2010. Although large cities in general experience an urban heat island effect, with warmer temperatures than their surrounding rural areas, this phenomenon is minimal in Bristol.