Not only is Saturday the day after Black Friday, but it is also the last day of fall, according to the meteorological calendar. By that calendar, fall — September, October and November — has encompassed extremes of both heat and cold and is ending up just about average.

Taking into account the forecasts for Saturday, Washington’s temperature for the entire 91-day period will finish about one-tenth of a degree above normal.

Such a figure, suggesting that nothing much happened, conceals as much as it reveals. Hidden in the blandness of the average were such notable days as Oct. 6, when the high reached 91 and the day’s average temperature was 17 degrees above normal.

Also shielded from recognition in the overall seasonal average is a day such as Nov. 24, when the temperature, as measured at Reagan National Airport, was below normal by the same 17 degrees.