The Weather Page

The Baltimore Sun

Dennis Mangold has a NOAA Weather Radio up in Ten Hills. "I hear them use the terms 'heating degree days,' and 'cooling degree days.' What are they and how are they computed?" Degree days are a proxy measure of demand for heating or cooling energy. Got a pencil? Take the day's average temperature. Subtract to find the difference from 65 degrees. If today averages 50 degrees, that's 15 heating degree days. A 75-degree average yields 10 cooling degree days. Tallied by month or season, they provide useful comparisons.

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