In Washington, Friday, in its pleasant temperatures and its bright, dry air seemed to suggest the end of summer, and seemed specially suited to the eve of the Labor Day weekend, which is often regarded as the unofficial end of summer.

In the capital, three days before Labor Day, and 10 full weeks after the summer solstice, it seemed on Friday that summer had been given a thorough chance to show its stuff, its full array of days steamy and days dry, days sizzling hot and days less hot.

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