One thing that is interesting is that the illness itself is called a “cold”, so originally that must have been what people thought caused it.
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the cold temperatures lower the immune systems ability to fight the viruses and also mean runny noses and such thus spreading the virus around more. this is also the time of year most viruses start to spread from asia ( where a lot of them come from )
I think, and I stress think, that viruses travel faster through a cold environment.
Why is this the case? Because when the immune reaction is feeble or compromised, its agitative response is influenced. If you need healthy immunological reaction, keep your glutathione levels up.