A distance correlated with the area of a city in which a person would want to walk during the winter or in the cold.

In northern cities, a summer radius is usually much larger than a winter radius, due to the warmer weather and better walking conditions.
Do you want to go to the wine bar? -No, let's go to the Irish pub down the street - the wine bar is definitely outside our winter radius.
by mugs021 January 2, 2011
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