Guam and the Northern Mariana Islands both have a trade-wind tropical rainforest climate (Köppen Af). The Younger Dryas impact hypothesis or Clovis comet hypothesis posits that fragments of a large (more than 4 kilometers in diameter), disintegrating asteroid or comet struck North America, South America, Europe, and western Asia about 12,800 to 11,700 years ago. In terms of deaths from heat waves, 7,415 losses occurred between 1999 and 2010, a mean of 618 per year. On average, the mountains of the western states receive the highest levels of snowfall on Earth. North America, extending to within 10° of latitude of both the equator and the North Pole, embraces every climatic zone, from tropical rain forest and savanna on the lowlands of Central America to areas of permanent ice cap in central Greenland. The narrow canyons of many mountain areas in the west and severe thunderstorm activity during the monsoon season in summer leads to sometimes devastating flash floods as well. It was discovered by Columbus in 1492 AD. North America's major continental divide is the Great Divide, which runs north and south down through Rocky Mountains.  The El Niño-Southern Oscillation affects the precipitation distribution, by altering rainfall patterns across the West, Midwest, the Southeast, and throughout the tropics. Climate change and oil and gas drilling could affect their numbers in the future. , Varies due to changes in latitude, and a range of geographic features, Gulf Coast/Lower Mississippi Valley/South Atlantic states, Southern Plains/Lower Midwest/Middle East Coast, Northern Great Plains/North-Central/Great Lakes/New England.  Livestock are often moved between high-elevation summer pastures and low-elevation and winter pastures. However, occasionally frozen precipitation (snow, sleet and/or freezing rain) can occur (more commonly in interior and northern areas) when southerly-tracking storms throw Gulf or Atlantic moisture over cold air at ground level. The Gulf and South Atlantic states have a humid subtropical climate with mostly mild winters and hot, humid summers. The Southwest has the worst droughts; one is thought to have lasted over 500 years and to have decimated the Anasazi people. Columbia, SC, Fayetteville, NC, Raleigh, NC, Wilmington, NC, and Norfolk, VA), July and August are usually the wettest months, and precipitation is fairly evenly distributed the rest of the year. North America can also be divided into four great regions: O'Neil, Jonathan; Carlson, Richard W.; Francis, Don; Stevenson, Ross K. (2008-09-26).  In terms of deaths caused by cold waves, the same gender inequality exists; 66% of hypothermia-related deaths in 2002 were of males. It is commonly called the United States, the United States of America (shortened to U.S. and U.S.A.), and also sometimes just America.. Starting 2.58 Ma, the Quaternary glaciation covered much of the continent with ice, centered west of Hudson Bay, the floor of which is slowly rebounding after being depressed by the great weight of the ice. This means the climate is generally dry, with cold winters and hot summers, but with the wide variation that is to be expected over a continent extending from the Arctic Circle to the tropics. The trees shed their leaves in autumn. The climate in South America is much more volatile further south. Miami (/ m aɪ ˈ æ m i /), officially the City of Miami, is a metropolis located in southeastern Florida in the United States.It is the third most populous metropolis on the East coast of the United States, and it is the seventh largest in the country. From late summer into fall (mostly August to October), tropical cyclones (hurricanes, tropical storms and tropical depressions) sometimes approach or cross the Gulf and Atlantic states, bringing high winds, heavy rainfall, and storm surges (often topped with battering waves) to Gulf and Atlantic lowlands and coastal areas.  Over the top of the ridge, the jet stream brings a summer precipitation maximum to the Great Lakes. The state of Alaska, on the northwestern corner of the North American continent, is largely dominated by a subarctic climate, but with a subpolar oceanic climate in the southeast (Alaska Panhandle), southwestern peninsula and Aleutian Islands, and a polar climate in the north. (2007). Answer: North America lies within the temperate zone. The climate in the Coastal Plains is that of great variety. "<, Hawaii has 11 different climate zones, influenced by altitude and topographical effect on wind and rainfall. 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