I was out in the upper teens and low 20's(F) a couple weeks ago in PA for a good 45 minutes or so. One piece thermal suit + fleece hoodie + waterproof boots + thermal socks + 40gram thinsulate gloves + ATV mitts = mostly comfortable haha.
Stupid salt kills a bike though. After riding in a slight mist on roads that had salt on them, I had to scrub every inch of my bike. Anywhere I saw the stupid white salt, I sprayed down with WD40 and scrubbed with a nylon brush to make sure salt was gone. My chain which I cleaned/lubed the next day already had surface rust forming.