+1.

I think many of us have benefitted from several years of bike commuting by choice before ridding ourselves of the automobile. It is one thing to ride during the Summer as a lark. A real commitment to continue doing so through the Winter.

Many of us have personal limits, below which, we won't ride. Mine are 28F and dry roads. When the conditions don't suffice I just walk a few blocks and hop on the Metro. What are you going to do when its 0F or colder and the wind is howling up a blizzard? Is your wife going to want to play taxi?

jayuse - the rational part of my brain says to tell you go through the Winter and see how dependent you remain on your 2nd vehicle.

On the other hand ... I think we all are capable of so much more than we realize and, sometimes perhaps, we must move out of our comfort zones before we can transcend to something else.

One stratagem to win your wife's support is this:
Agree that the monthly savings by not having the 2nd car get deposited into a separate bank account. Determine a specific purpose for this money that you both will enjoy - say a nice trip to Hawaii! That will make riding through Winter enjoyable as you contemplate a future day when your toes are lapped by the warm tropical waters.