Weather doesn't often enter into my equations -- if I feel like going out or have to do something, I do. Rain, snow, cold, don't bug me. Actually I like them. Long as I have the right clothes, not a biggie. I've gone on vacation to NW England in January, Munich in December, Florence in February, Montreal in April... Obviously I'm not too phased!
The funny thing for me is that many people make a huge deal over the weather when in fact they are going to be -driving- to their destination, not walking or waiting on a bus or anything, so you'd think they'd care less about, say, cold weather. (I understand snow, but drizzle? cold weather? clouds?) They're outside for the 30 sec. it takes to get from the car to inside, so... what's the deal?
I especially love freezing, windy weather. It's so refreshing to me, cleansing. Rain too. And I love snow, though the fact I don't drive (and even if it did snow in Atlanta, I wouldn't have a driveway to shovel) makes that easy, huh?
As for getting stir crazy, no, not really. Growing up somewhere where it's rather dark and cold about 6 mo. of the year left me without some expectation I should have a "right" to picnic or bike or eat al fresco in January. (Although sometimes you can -do- that in Atlanta!) I can easily spend a whole day inside, including in good weather, and not feel cut off from things. But then again, I cope with being on my own pretty well in general.