Okay, you know it’s cold when you look at Baltimore’s Inner Harbor and see parts of it completely frozen over, so solidly that a beer bottle sits atop it, rolling placidly with the waves that rock beneath, while seagulls walk on the sheet, picking at bits of food that tourists have thrown to see how hard the ice is.

Or if you want colder, Dave Nat went to Montauk Point and got photos of frozen sea foam. Of course, if you want even colder, there’s always Antarctica.