thirty-day forecast

thirty-day forecast

[¦thər·dē ¦dā ′fȯr‚kast]
(meteorology)
A weather forecast for a period of 30 days; as issued by the U.S. Weather Bureau, the forecast concerns expected departures of temperature and precipitation from normal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.