The Weather Blog

THE WEATHER BLOG

October 24, 2008|By frank roylance | frank roylance,frank.roylance@baltsun.com

J ohn McDaniel of Baltimore and others were surprised to learn here that Baltimore's average first frost was 18 days later than Annapolis'. It may be the "heat island" effect, in which buildings and pavement retain and radiate more solar energy than less-urban areas. Average July temperatures in Washington are 3.5 degrees warmer than at Dulles Airport. January's are 3.2 degrees warmer.

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