Palermo experiences a hot-summer Mediterranean climate (Köppen climate classification: Csa). Winters are mild and wet, while Summers are warm to hot, and dry. Palermo is one of the warmest cities in Europe (mainly due to its warm nights), with an average annual ambient air temperature of 18.5 °C (65.3 °F). It receives approximately 2,530 hours of sunshine per year. Snow is rare but not impossible. In the late 40's and in the early 2000s it snowed as far as the harbour eight times. More often snow stopped on the edge of the city.
Average annual temperature of the sea is above 19 °C (66 °F), from 14 °C (57 °F) in February to 26 °C (79 °F) in August. In the period from May to November, the average sea temperature exceeds 18 °C (64 °F) and in the period from June to October, the average sea temperature exceeds 21 °C (70 °F)