When Is The Last Day Of Summer 2024 In Usa. In the southern hemisphere, it will occur on december 21, 2024. โ the first official day of summer astronomically for 2024 is thursday, june 20, which is when the northern hemisphere has the longest day of the year, according to the.
In the southern hemisphere, it occurs in late december. * the dates of the seasons given on this page are for the northern hemisphere (dates for the us)
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