I live in the midwest and we get some pretty huge temp changes. Some winters are bad but most are mild. I owned an awd e90 328 thinking it'll be better in the snow but changed to rwd on every car after that. I didn't find much of a difference between all and rear wheel in mild to medium (~2-3") snow traction, but I was on all seasons. I generally change out the summer tires around late November. The only times I had problems getting traction was on ice or deep snow but I would imagine everyone will share the same issues.
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