It has formally been summer since last Friday (June 21) but if I had to base my assessment of the season solely on the weather, I’m not sure I’d agree that it is summer.  With the exception of a few days at the beginning of the month, it has been as cool as it was back in April and May.  And then there’s the rain:  Almost five inches so far this month.

Weather aside, not everyone would agree that summer started on the summer solstice, especially those living in the southern hemisphere where the seasons are the opposite of ours on the north half of the planet.  I was reminded of this by a recent post (from Australia) by BetR2 (see “Am I Learning or Just Confused??? When is the first day of the season again?”).  For her, the start of winter was the source of her confusion.  It seems that there is no consensus as to what officially starts (or ends) a season.

Growing up, I was taught that summer occurred during June, July and August; fall spanned September, October and November; the winter months included December, January and February; leaving March, April and May for spring (although spring almost never lasts three months, even in the northeast US!).  BetR2 was similarly instructed, it appears, although of course, the seasons—and not the calendar—are reversed where she lives.

Others (such as the folks at Google) base the seasons on the astronomical milestones:  the summer and winter solstices and the autumnal and vernal equinoxes.  Followers of this philosophy tend to be staunch despite the irony that summer begins with the days getting shorter and winter with the days getting longer.  I think there is some meteorological basis for this, however, due to heat lag.  In summer, the nights are not long enough for the day’s heat to dissipate and as a result, it continues to accumulate after the shortest night occurs.  The temperature gets hotter even as the days grow shorter.  Eventually, though, the conditions reverse and we start heading back towards cooler days and, eventually, winter.

Another practical approach is to use holidays as the demarcation points.  In the US for example, summer “officially” begins with Memorial Day (the last Monday in May) and ends on Labor Day (the first Monday in September).  Christmas often considered a good time for winter to start (although some would argue for Black Friday, which follows Thanksgiving and opens the holiday shopping season).  To round out the seasons, Easter makes a nice transition from winter to spring, with its obvious connotations of rebirth.  Naturally, there are strong cultural, ethnic, and religious influences on this practice.

However defined, it is now summer (in the northern hemisphere) by any calendar.  All we need now is for Mother Nature to catch up.

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