[video=youtube_share;JMjhTGArPwk]http://youtu.be/JMjhTGArPwk[/video] Minus-13 Degrees. Minnesotans Go Surfing On Lake Superior | Gear Review | Gear Junkie
Superior normally only freezes around 40-90% of the surface area. It freezes over completely about every 20 years or so.
I think 2 years ago, some people tried this in Chicago and the police came and arrested them. Good old Chicago.