It's not just folklore but fact. Colds are more common in winter than in the summer, according to the 2018 National Health Interview Survey. When Americans were asked whether they had experienced a head or chest cold in the past two weeks, 16.6 percent said yes in the winter months of January through March. Only 7 percent said yes in the summer months of July through September...
Percent with a head/chest cold in the past two weeks
16.6% in the winter (January-March)
8.5% in the spring (April-June)
7.0% in the summer (July-September)
13.7% in the fall (October-December)
In every season, children under age 18 were most likely to have had a cold. In the winter, more than 20 percent of children had experienced a cold in the past two weeks. In every season, people aged 65 or older were least likely to have had a cold.
Source: CDC, Morbidity and Mortality Weekly Report, Percentage of Person Who Had a Cold in the Past 2 Week, by age Group and Calendar Quarter—National Health Interview Survey, United States, 2018
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