<P> In North America , autumn is usually considered to start with the September equinox ( 21 to 24 September ) and end with the winter solstice ( 21 or 22 December ) . Popular culture in North America 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 . In Australia and New Zealand , autumn officially begins on 1 March and ends on 31 May . </P>
<P> In North America , autumn is usually considered to start with the September equinox ( 21 to 24 September ) and end with the winter solstice ( 21 or 22 December ) . Popular culture in North America 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 . In Australia and New Zealand , autumn officially begins on 1 March and ends on 31 May . </P>
when is it fall in the northern hemisphere
when is it fall in the northern hemisphere
start with the September equinox ( 21 to 24 September ) and end with the winter solstice ( 21 or 22 December )
start with the September equinox ( 21 to 24 September ) and end with the winter solstice ( 21 or 22 December )