In North America, autumn traditionally starts on September 21 and ends on December 21. It is considered to start with the September equinox (21 to 24 September) and end with the winter solstice (21 or 22 December). Popular culture in the United States associates Labor Day, the first Monday in September, as the end of summer and the start of autumn; certain summer traditions, such as wearing white, are discouraged after that date. As daytime and nighttime temperatures decrease, trees shed their leaves. In traditional East Asian solar term, autumn starts on or around 8 August and ends on or about 7 November. In Ireland, the autumn months according to the national meteorological service, Met Éireann, are September, October and November. However, according to the Irish Calendar, which is based on ancient Gaelic traditions, autumn lasts throughout the months of August, September and October, or possibly a few days later, depending on tradition. The names of the months in Manx Gaelic are similarly based on autumn covering August, September and October. In Argentina , Australia and New Zealand, autumn officially begins on 1 March and ends on 31 May.
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