I make no apologies for driving when I consider the weather unsafe or just too nasty for riding. I tried riding once in the snow/sleet and fell over within the first 100 yards, and I was on a mountain bike with knobby tires. I don't even consider it now, particularly since a snowy winter for us is 1-2 storms. I also won't ride if the weather is too rainy, windy, foggy or otherwise undesirable. I'm not a pro getting paid to ride, and I've got a nice car that gets decent gas mileage. I still manage to ride 9,000+ miles/year so it's not like I need the mileage.