Per the rules, we don't do rules philosophy questions. It's been that way since the TacOps first printing, so it's consistent if nothing else.
I do agree it's extremely silly; I can only assume it was written by someone who lives in Florida or something. I'll look at queuing it up for errata.
EDIT: I should note for completeness' sake that the BMM separates snowfall from temperature, so if you're using that version of the weather rules you don't have to automatically mix the two.