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Source: Centers for Disease Control and Prevention. www.cdc.gov
In the Northern hemisphere, winter is the time for flu. The timing and duration of flu seasons vary. While flu outbreaks can happen as early as October, most of the time influenza activity peaks in January or later. During the past 26 flu seasons, months with the heaviest flu activity (peak months) occurred in November one season, December four seasons, January five seasons, February 12 seasons, and March four seasons.
Peak Month of Influenza Activity
Over the Previous 26 Seasons 1982-83 through 2007-08
Number of Seasons