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Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within 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). [89]
Köppen climate types of the United States. The climate of the United States varies due to changes in latitude, and a range of geographic features, including mountains and deserts. Generally, on the mainland, the climate of the U.S. becomes warmer the farther south one travels, and drier the farther west, until one reaches the West Coast.
The Appalachian temperate rainforest has a cool and mild climate and meets the criteria of temperate rainforests identified by Alaback. [1] Temperature and precipitation are extremely variable with elevation, with rainforest conditions usually but not always concentrated around spruce–fir forests at higher elevations.
Harvey's storm total rainfall is the most recorded within the United States. [ 120 ] [ 121 ] Harvey's extremely heavy rainfall produced catastrophic flooding across much of southeastern Texas; particularly in and around the Houston metropolitan area , where accumulations exceeded 40 in (1,000 mm) over a four-day period. [ 120 ]
This instance or more likely from a non-tropical storm pushing slowly eastward from the Great Plains, would result in a more even distribution of rainfall in the southern United States that should ...
United States: 417.4 19.2 21.9 17.5 11.0 16.6 25.8 46.3 74.5 ... Average monthly precipitation (in mm) for selected cities in South America City Country Year Jan Feb ...
Areas of Kentucky experience significant rainfall, flooding: See photos In this aerial view, the Barren River floods after a rain storm on February 16, 2025 in Bowling Green, Kentucky.
The eastern half of the contiguous United States east of the 98th meridian, the mountains of the Pacific Northwest, and the Sierra Nevada range are the wetter portions of the nation, with average rainfall exceeding 30 inches (760 mm) per year.