The Weather Page

January 09, 2007|By FRANK ROYLANCE | FRANK ROYLANCE,Sun Reporter -- Weather Blogger

Allan Posner, in Owings Mills, noticed that our coldest average high temperatures occur around Jan. 17, and not at the winter solstice in December when days are shortest. "Why is the temperature trough centered on that date?" he asked. He guessed, correctly, that the oceans play a role. It takes time for heat stored in the air, land and water to dissipate as solar input diminishes. There is also a lag in reheating as days lengthen. So the hottest averages center on July 20 - a month after the summer solstice.

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