Cold snap

Cold snap is used in two ways to describe climate:

in meteorology, a period of intensely cold and dry weather, often occurring during an Ice Age
an unseasonally cold period in spring. This may also be called a blackberry winter as it may coincide with the time when the blackberries bloom. It may also be called a dogwood winter. In Tennessee dogwood winter and blackberry winter are two separate occasions. Dogwood being first and blackberry a couple of weeks later.
Cold wave

Other uses of the phrase include:

Coldsnap, an expansion set for the trading card game Magic: The Gathering
Coldsnap, a member of DC Comics Masters of Disaster supervillain team
Cold Snap (album), the first full-length album released by the Weeping Tile
"Cold Snap" (Heroes), an episode from the third season of the TV series Heroes
Cold Snap (band), a metal band from Croatia

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