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Annual Precipitation Trends 1901-2005

Map of the United States, depicting precipitation trends from 1901-2005. The greatest increases in precipitation were in the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (-9.25 percent). Precipitation in the Northeast increased by 7.31 percent, in the Southeast by 2.96 percent, the Central United States by 7.91 percent, the West North Central by 2.96 percent, the Southwest by 1.47 percent, the West by 8.96 percent, the Northwest by 5.45 percent, and Alaska by 6.08 percent.
Green shades indicate a trend towards wetter conditions over the period, and brown shades indicate a trend towards dryer conditions.
No data are available for areas shaded in white.
Data courtesy NOAA's National Climatic Data Center.

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