it's raining here and i just went for a ride. all i had was one of those sks seatpost fenders so i'm still hopelessly wet but it was really peaceful. plus mad skidzzzzzz.
and riding fixed in the rain is much better than freewheel. when you need to slow down, you can feel when the traction slips out through the pedals unlike a freewheel. i had a few sketchy moments with on the road bike i commuted on last year through rain and an epic winter. luckily, i knew how to skid so i'd just slide sideways through a turn, and then go home and congratulate myself on being a nerd.