I would imagine you're being downvoted by people who don't know what winter in Chicago is like. ^^
People underestimate how much nicer the world is away from the Chicago-Boston-DC triangle.
Seems like the coldest high temperature in Chicago's recorded history was -11ºF
FWIW I've lived in both SF and Chicago and quite like Chicago's climate/seasons and really liked the city life much more than I did in SF (although the stuff a couple hours from SF is fantastic), and I'm not at all alone (I live in NY now)