Hong Kong has a humid subtropical climate (Köppen Cwa), characteristic of southern China, despite being located south of the Tropic of Cancer. Summer is hot and humid, with occasional showers and thunderstorms and warm air from the southwest. Typhoons occur most often then, sometimes resulting in floods or landslides. Winters are mild and usually sunny at the beginning, becoming cloudy towards February; an occasional cold front brings strong, cooling winds from the north. The most temperate seasons are spring and autumn, which are generally sunny and dry. When there is snowfall, which is extremely rare, it is usually at high elevations. Hong Kong averages 1,709 hours of sunshine per year; the highest and lowest recorded temperatures at the Hong Kong Observatory are on 22 August 2017 and on 18 January 1893. The highest and lowest recorded temperatures in all of Hong Kong are at Wetland Park on 22 August 2017, and at Tai Mo Shan on 24 January 2016.