Obviously, diseases like the cold and flu are cause by viruses, so weather alone wouldn’t cause it. So why do we get runny nose, sneezing, and other symptoms when we go out in the cold without a jacket?
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Imagine your nose and sinuses are a little water balloon you carry around with you. If you put a water balloon in the freezer for 45 minutes, then take it out to let it come to room temp a lot of things would happen. You would notice that the water in the balloon begins to turn to slush (stuffy nose), or that the balloon might spring a leak (drippy nose). Your body and your sinuses are very dynamic environments that are highly affected by temperature and humidity changes.
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