This is a somewhat late submission to the pseudo-discussion on optimum temperatures:
Maybe it’s because I’m a native-born Minnesotan,

but I don’t mind cold weather that much (though I can’t abide temperatures lower than 10? Fahrenheit). For that matter, I'm actually not too heavily affected by high temperatures either (contrary to popular belief, it can actually get quite hot in Minnesota during the summer

:). It's high humidity that causes me problems. Provided I have a little bit of air circulation, I can tolerate 85? F or higher, but as soon as it gets humid, I become as lethargic as a three-toed sloth.