Where I live we also have about 4 months of extreme cold temperatures. I keep a few luxury bags aside just for these winter months, and they’ve all held up very well. One is a Proenza Schouler PS1 for everyday, and another one is a Ferragamo top handle crossbody (in textured leather) if I wanted to carry less or if I wanted to be more dressier. I purchased both on big discounts and therefore it doesn’t make me feel too terrible if they get a bit beat up. I’ve had both for about 4 years already and wore them for 4 winters straight.
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For wet weather (storm, hail, freezing rain, blizzard, you name it), I wear longchamp nylon bags. I wouldn’t wear my more fragile luxury pieces during winter, but still want to enjoy my stuff as much as can be, otherwise winter’s gonna feel too long