just layer up; the following got me through a full work day of heavy rain/sleet at 18 degrees a few weeks ago...

head: gaiter, wool cap
torso: cotton thermal (x2), long sleeve shirt, fleece, hoodie, waterproof shell
legs: cotton thermal (x2), jeans, waterproof shell
hands: pearl izumi gavia gloves
feet: athletic socks, wool socks, plastic bags (they leaked at the end of the day. i tipped over in front of a doorman because my feet were numb and i couldn't feel my way out of the clips.)