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.