Cooling the past: 50-year-old actress Lea Thompson claims she remembers a Minnesota below-zero (Fahrenheit) cold streak about ten times longer than the 1912 record streak

...and she thinks that CO2 is the reason why we haven't matched that imaginary streak lately.

 Lea Thompson Talks THIN ICE, BACK TO THE FUTURE Musical, the RED DAWN Remake, More

I am actually from Minnesota. I moved away when I was 18, but I did my share of scraping windows and waiting for the bus. When I was a little girl, there were two and a half months where it never went above zero. Not once, for that long. It was before global warming, and it was freezing cold, when I was a little girl in Minnesota.

Cold Waves in Minneapolis, Minnesota - Yahoo! Voices - voices.yahoo.com

If below freezing records don't chill you to the bone, consider the number of consecutive hours with temperatures below zero. The longest stretch (186 hours) occurred between 8pm on December 31, 1911 and 1pm on January 8, 1912.