0 to 5, depending on the weather.

This week, it may be 1, as rain is forecast the rest of the week, and it isn't worth the hassle to me to bring a change of clothes or buy rain gear.

If rain is forecast in the afternoons but it isn't raining in the morning, then I'll commute anyway.

It really sucked to drive this morning to the train station instead of biking, and paying to park was the icing on the cake.

In the winter, it will probably be 0 days per week; I'm not that hardcore.