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In page White Christmas (weather):

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Because Christmas occurs during the summer in the Southern Hemisphere, white Christmases are especially rare events there, apart from Antarctica, which is generally uninhabited. A white Christmas elsewhere in the Southern Hemisphere is approximately equivalent to having snow in the Northern Hemisphere on 25 June. Some places like Ushuaia, Argentina and Stanley, Falkland Islands have received measurable snowfall on Christmas Day on numerous occasions.[citation needed]