It is true that a 'cold' is not caused by low temperature and yet there IS a correlation between the flu season and colder months. Why? Because 'science' says so.
https://www.newscientist.com/article/dn12808-cold-weather-really-does-spread-flu/
Interested in an annual flu shot?
Consider that the flu shot is redundant since it only works on people with strong immune systems and thus do not need that vaccine to begin with.