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"Colds are caused by chilly weather"

Viruses cause colds. If mucous membranes are cooled along the airways, they are less irrigated by blood. At this stage they can be more easily attacked by pathogens. Mucous membranes are most sensitive to cold and moisture. Explanation for the fact that cold occurs more often in winter than summer is that, in winter, people spend more time together indoors.
Facts from Health