I was planning to ride my old beater bike to work through the winter months last year. I bought some cheap fenders in preparation. After the first few rides to work in 30 degree weather, I realized that I wasn't having any fun. My hands were freezing despite wearing gloves. The more I thought about it, a 10 mile ride in the Michigan snow and cold just didn't seem like fun to me.
That was the turning point where I admitted to myself that I am a fair weather cyclist for now. This is also the reason that I didn't add fenders or a rack to my new bike. I ride with a backpack and enjoy how light my bike feels under me as I ride.