It's just so refeshing to be out there and a cup of soup afterwards just tastes better
And the other bikers (the few that are also out there) are much friendler "There is another nutter going out in this weather".
It certainly beats being inside on the rollers, I hate that, it's so hot (sweaty) and BBBBOORRRRRIINNNNGGGG.
You should probably cut down the milage a bit, so you don't freeze of any bodyparts on long rides. I often have winterfrost toes by the end of the winter but that goes away during the warmer period.