2nd on the fun writing 
I try not to bike for long in heavy rain if I can avoid it, but I get hot just thinking about using a hood... I wear a jacket with no hood (very seldom a true waterproof, actually), a Buff or a wool neck gaiter to stop the dribbles, and a windproof skull cap underneath my helmet. I haven't tried a helmet cover though.
Feet are my biggest problem. I wear neoprene shoe covers and get all hot and clammy, but I just HATE getting water in my shoes.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett