Hawaii is the rainiest state in the United States, with a yearly average of 63.7 inches (1618 mm). However, few areas in Hawaii are representative of the state's average. Many weather stations on the islands receive less than 20 inches (508 mm) of rain each year, while others receive far more (2540 mm). The main island, Hawaii, averages 63 inches (1565 mm) of rain per year.
The next highest amount of annual precipitation is found in California at 52 inches (132 cm). Most of California experiences some form of precipitation every month of the year, with the greatest amounts occurring in winter and spring when storms move across the continent from the Pacific Ocean. Summer months are generally dry except in the coastal regions where hurricanes can bring heavy rains into southern California.
Rainfall varies greatly between locations within both states. In fact, one location within Hawaii - Hilo - receives more than 3 feet (91 cm) of rain per year, while another - Mauna Kea - gets no rain at all!
Rainfall is caused by clouds forming over warm oceans or hot spots beneath them. These clouds release their water vapor through evaporation into the atmosphere. As long as there is heat energy available, then there will be rain. Heat comes from two sources: the sun and Earth's core. When solar radiation increases, so does the temperature of our planet's surface, which leads to more evaporation and therefore more rain.
The United States' Rainiest States Hawaii Hawaii is the wettest state in the United States, located in Oceania. Louisiana Louisiana is the second-wettest state in the United States. It is situated in the country's deep south and has a humid subtropical climate. Mississippi Mississippi, located in the southeastern United States, is the third-wettest state in the country. It is also known as the "Show Me State" due to its motto which is translated from French as "For if you will show me your way, I will walk in it." Missouri Missouri is the fourth-wettest state in the country. It is located in the central United States and has a temperate continental climate. Arkansas Arkansas is the fifth-wettest state in the country. It is located in the southern United States and has a tropical wet and dry climate.
See also: Which is the driest state in the United States? - wikiHow
Hawaii is the wettest state, with the most average annual rainfall of any state. California is second, with an average of. These two states account for nearly 80 percent of the total average annual precipitation in the United States.
The remaining states and Puerto Rico have less than 60 inches of average annual precipitation. Florida has the lowest percentage of its area that is covered by water, about 5%. Most of the state is dry land.
Rainfall is distributed fairly evenly throughout Hawaii. Cities such as Honolulu gain most of their water from the rain; they estimate that 70% of their drinking water comes from the sky.
California's center of rainfall is located in Northern California, near the border with Oregon and Washington. Here, temperatures are cooler than in other parts of the state, which causes clouds to form more easily. These clouds eventually fall as rain or snow everywhere in California.
Mountains play a major role in determining where this rain goes. In Hawaii, most of the rain falls on the leeward side of the islands, while in California it is flushed out toward the ocean. Some of this water flows down into Mexico, but most reaches the Pacific Ocean through canyons that cut deeply into the desert floor.
America's Driest States Nevada is the least wet state in the United States, receiving approximately 9.5 inches (241 mm) of rain every year. Year after year, the mountain states, particularly Wyoming and Montana, lead the list of America's driest states. By comparison, California, which is known for its rainy climate, receives an average of 44 inches (110 cm) of rain per year.
The country's wettest area is located in central India. The Ganges River Basin supports an average of 40 in (100 cm) of rainfall annually. The basin also contains some of the most advanced agricultural lands in Asia.
Another very wet area is found in Antarctica. Although not considered part of any continent, Antarctica has its own unique weather patterns: it is cold throughout the year and windy. It gets snowfall at all times of the year but is mostly covered by ice sheets during winter. As a result, most areas are completely inaccessible by vehicle.
In conclusion, the American West and Central India are the world's wettest regions based on average annual precipitation.