The climate is tropical with a distinct warm period (December–April), during which the temperatures rise above 32 °C (89. 6 °F), and a cooler period (May–November), with temperatures rarely rising above 27 °C (80. 6 °F). The temperature increases from 23 to 27 °C (73. 4 to 80. 6 °F), and the annual rainfall is from 1,700 to 2,970 millimetres (66. 9 to 116. 9 inches) as one moves from Tongatapu in the south to the more northerly islands closer to the Equator. The average wettest period is around March with on average 263 mm (10. 4 in). The average daily humidity is 80%. The highest temperature recorded in Tonga was 35 °C (95 °F) on 11 February 1979 in Vava'u. The coldest temperature recorded in Tonga was 8. 7 °C (47. 7 °F) on 8 September 1994 in Fua'amotu. Temperatures of 15 °C (59 °F) or lower are usually measured in the dry season and are more frequent in southern Tonga than in the north of the island. The tropical cyclone season currently runs from 1 November to 30 April, though tropical cyclones can form and affect Tonga outside of the season.