[protein_lense]

Temperature and humidity can have a marked effect on the stability of enveloped viruses themselves. e.g. coronaviruses & RSV, which comprise a subset of the viruses responsible for common colds. Another common cold virus, Rhinoviruses, are non-enveloped.

[jiggawatts]

Which is true, but studies have shown that it is the increased time spent in the heated indoors that causes disease, not the time spent in the cold outdoors.