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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.
Meteorological dates for the start of seasons in the northern hemisphere are: 1st of December for Winter, 1st of March for spring, 1st of June for summer and the 1st of September for Autumn.