The Isles of Scilly features an oceanic climate (Köppen climate classification Cfb). The average annual temperature is 11.8 °C (53.2 °F), by far the warmest place in the British Isles. Winters are, by far, the warmest in the country due to the moderating effects of the ocean, and despite being on exactly the same latitude as Winnipeg in Canada, snow and frost are extremely rare. The maximum snowfall was 23 cm (9 in) on 12 January 1987. Summers are not as warm as on the mainland. The Scilly Isles are one of the sunniest areas in the southwest with on average 7 hours per day in May. The lowest temperature ever recorded was −7.2 °C (19.0 °F) and the highest was 27.8 °C (82.0 °F). The isles have never recorded a temperature below freezing between May and November. Precipitation (the overwhelming majority of which is rain) averages about 34 inches (86 cm) per year. The wettest months are from October to January, while May and June are the driest months.
Text thanks to wikipedia.org