Question: when do the different seasons start and end

title: Season
text: Meteorological seasons are reckoned by temperature , with summer being the hottest quarter of the year and winter the coldest quarter of the year . In 1780 the Societas Meteorologica Palatina ( which became defunct in 1795 ) , an early international organization for meteorology , defined seasons as groupings of three whole months as identified by the Gregorian calendar . Ever since , professional meteorologists all over the world have used this definition . Therefore , for temperate areas in the northern hemisphere , spring begins on 1 March , summer on 1 June , autumn on 1 September , and winter on 1 December . For the southern hemisphere temperate zone , spring begins on 1 September , summer on 1 December , autumn on 1 March , and winter on 1 June . In Australasia the meteorological terms for seasons apply to the temperate zone that occupies all of New Zealand , New South Wales , Victoria , Tasmania , the south - eastern corner of South Australia and the south - west of Western Australia , and the south east Queensland areas south of Brisbane . 

Answer: answer: In 1780 the Societas Meteorologica Palatina (which became defunct in 1795) defined seasons as groupings of three whole months as identified by the Gregorian calendar.  For temperate areas in the northern hemisphere, spring begins on 1 March, summer on 1 June, autumn on 1 September, and winter on 1 December.  For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.