Nevada receives 241 mm of rain annually while Hawaii gets 1,618 mm. Death Valley sees about 50 mm, Mount Waiʻaleʻale over 11,700 mm. The United States shows extreme precipitation contrasts shaped by mountains, coastlines, and seasonal patterns. Since 1901, precipitation has increased 4.6 mm per decade nationally, but the Southwest has become drier while northern and eastern regions receive more rainfall.