I figure there are three ways of calculating the seasons. First is the calendar: More or less the 20th of March, June, September and December announce the beginning of whichever season, as most people commonly accept.
Second, as inferred by the title of this blog, I choose to observe the first day of each of those months as the beginning of the season. September's weather, even early September, usually resembles autumn weather more than summer, December's more like winter than autumn, March more like spring than winter, and June more like summer than spring. Already in September we find ourselves closing the windows at night because it's starting to get darned chilly before daybreak.
Third, I note that about one month after the official beginning of each season, the weather is the most like that season. About the 20th of October the trees are in full color (past that, farther north). About the 20th of January it is the coldest. About the 20th of April everything is green and growing fast. And about the 20th of July it is the hottest.
So here it is, September. The birds are flocking. The lines at the ice cream store are not quite as long as they were, even on the weekends. Whole days go by when the very idea of flipping on the A/C does not cross my mind. We don't need the fans running overnight. Yeah, we're past peak heat. Chances of another day in the high 90s fade with each passing sunset. I suspect we'll hear of a low in the 40s before we again see a predicted high over 95. (As I write, the predicted highs and lows for the next few days are 81-53-84-55-82-57-81-60-86-63-83-63-80.)
We're a long way from snow yet. The earliest I've seen it in Pittsburgh was October 11, 1988. The earliest big snow in Pittsburgh was the Halloween 1993 snowstorm. So winter and winter-like weather is still many weeks away. Still, that threshold has been crossed. We're done with summer.
* * * End original post * * *
* * * Original comments from 2007 * * *