'''First day of summer''' may refer to:
* The beginning of the summer half of the year in the early Germanic calendars * The beginning of the summer half of the year in medieval and modern Scandinavian culture, observed in April ** First day of summer (Iceland), a public holiday in Iceland * Start of the meteorological summer, June 1 in the Northern Hemisphere<!-- https://www.almanac.com/content/first-day-summer-summer-solstice -->
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