Steve Karnowski and Rick Callahan, writing for the Associated Press, via the SF Chronicle:
More than 3,700 flights were canceled by late Monday afternoon, following a weekend of travel disruption across the U.S. Airline officials said de-icing fluid was freezing, fuel was pumping sluggishly, and ramp workers were having difficulty loading and unloading luggage.
That’s how you know it’s cold: the de-icing fluid freezes.
Personally I’m enjoying the high 60s here in sunny Oakland.