I'll say it again: it's Seattle. We're at a latitude where the sun on it's best day in July would get its ass kicked by Texas' December sun. And we have trees: lots of them. So if you're picturing my dogs sitting in a barren Wal-Mart parking lot in the blazing summer sun, where that chart might accurately apply, please reimagine the scenario. Picture a car parked beneath shady evergreens in a place where the sun weakly peeks above the horizon for a bit.

As for that chart, it might accurate in Florida. But I've tested our camper van with its picture rear window facing south all day in July. Approximately 70F ambient, it got to low-90s in there, not 104F. I don't know what the dogs did when I was growing up when it would be 90s for days on end, but I don't recall them dying in droves.

Though that chart is a good way to bring the problem to light, I guess, don't be breaking my window based on its presumed accuracy for all situations.