Turns out, according to this chart just dispatched by the National Weather Service, it's not the high temps that were awful -- though there's that. It was the low temperatures. If you can call 'em that. Incidentally, NOAA says
95 on Sunday, with "north northeast wind between 5 and 15 mph, with gusts as high as 25 mph." And, for Tuesday night: "low around 68." Sweater weather.