<P> Days continue to lengthen from equinox to solstice and summer days progressively shorten after the solstice, so meteorological summer encompasses the build - up to the longest day and a diminishing thereafter, with summer having many more hours of daylight than spring . Reckoning by hours of daylight alone, summer solstice marks the midpoint, not the beginning, of the seasons . Midsummer takes place over the shortest night of the year, which is the summer solstice, or on a nearby date that varies with tradition . </P> <P> Where a seasonal lag of half a season or more is common, reckoning based on astronomical markers is shifted half a season . By this method, in North America, summer is the period from the summer solstice (usually 20 or 21 June in the Northern Hemisphere) to the autumn equinox . </P> <P> Reckoning by cultural festivals, the summer season in the United States is traditionally regarded as beginning on Memorial Day weekend (the last Weekend in May) and ending on Labor Day (the first Monday in September) 1981, more closely in line with the meteorological definition for the parts of the country that have four - season weather . The similar Canadian tradition starts summer on Victoria Day one week prior (although summer conditions vary widely across Canada's expansive territory) and ends, as in the United States, on Labour Day . </P> <P> In Chinese astronomy, summer starts on or around 5 May, with the jiéqì (solar term) known as lìxià (立夏), i.e. "establishment of summer", and it ends on or around 6 August . </P>

When does summer end in the united states
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