Florence is usually said to have a Mediterranean climate, although under the Köppen climate classification it may be borderline humid subtropical (Cfa). It has hot, humid summers with little rainfall and cool, damp winters. Due to being surrounded by hills in a river valley, Florence can be hot and humid from June to August. Because of the lack of a prevailing wind, summer temperatures are higher than along the coast. The rain which does fall in summer is convectional. Relief rainfall dominates in the winter, with some snow. The highest officially recorded temperature was 42.6 °C (108.7 °F) in 26 July 1983 and the lowest was ?23.2 °C (?9.8 °F) on 12 January 1985.