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When is the first day of summer 2010?

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Monday, June 21 - in the Northern Hemisphere
In the US, Canada, Europe, Central America, Asia:

Monday, June 21, at approximately midnight is the official first day of summer for 2010 in the Northern Hemisphere (Summer solstice).

On that day, the Southern Hemisphere observes the winter solstice and begins their winter season.


In Australia, Southern Africa and South America:
The official date of summer south of the equator (corresponding to the first official day of winter in places north of the equator) would be December 21.


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