Not only were these two published just one day apart, the jokes are identical, as is the fundamental physical impossibility. Neither one would appear to be related to a specific incident or place.
Bill Amend currently lives in Missouri, but Foxtrot isn’t tied to a specific location: “I’ve never established where the Fox family lives and I’m not sure the sort of place I depict really exists. It’s sort of that generic cartoon version of suburbia that a lot of strips share where it snows in the winter and is near water when necessary. I grew up in New England and Northern California, and I think bits of that come through, but it’s nowhere specific.“
B.C. takes place somewhere in Generic Cave Man Land, but Mason Mastroianni lives in upstate New York.
Comics I Don't Understand 
My original assumption was that both of these strips were simply commenting on current (topical) weather conditions, rather than “global warming“:
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P.S. However, as Dave Barry already pointed out nearly two years ago: “…the looming apocalyptic threat of catastrophic global climate change was finally eliminated, thanks to the breakthrough discovery that the solution — it has been staring us in the face all this time — was to throw food at art.“