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E. Elert. flu in winter. Flu season is in full swing across the U.S. this week, and it's right on time. Actually, it would have been on time if it showed up in November, too, or even in March--unlike the actual seasons, the timing of flu season is a little hard to predict. Except for one thing: it always happens in winter.
Yearly flu vaccination should begin soon after flu vaccine is available and, ideally, by October. However, getting vaccinated even later can be protective, as long as flu viruses are circulating. While seasonal influenza outbreaks can happen as early as October, influenza activity most often peaks in January or later.