United States - weather in June

June is the first summer month in the United States.
Temperatures are mild to pleasantly warm on the coast of the Pacific Ocean (see Seattle, San Francisco, Los Angeles), where a cold sea current flows. On the coast and on the islands of southern California, we are in the period of the "June Gloom" (possible formation of fog and cloud cover). Furthermore, the temperatures are mitigated by altitude in the Rocky Mountains (see Helena, Denver). For the rest, it's warm to hot in the center-north and very hot in the south. In the deserts of the southwest (see Phoenix), dry heat reigns, while in the central-eastern part, influenced by the Gulf of Mexico, the humidity is higher and therefore the weather is sticky and unpleasant.
Furthermore, heat waves can occur in almost the entire territory, especially in the second half of the month. In the north, heat waves are rarer and shorter, while in the center-south they last longer and are accompanied by high humidity.
If we exclude the Pacific coast and the arid plateau known as Great Basin (see Utah, Nevada and southeastern Oregon), where summer is the driest season, the rains increase in much of the territory. In fact, on average, summer is the wettest season, and June is the wettest month in the United States.
Thunderstorms can break out even in the Great Plains, where there is little rain in the rest of the year.
April through June is the time when tornadoes are most frequent in east-central United States. They develop within particularly intense thunderstorm cells.
The hurricane season begins in June, which can affect the states bordering the Gulf of Mexico (Texas, Louisiana, Mississippi, Alabama and Florida) and the southernmost states of the Atlantic Ocean (Georgia, North and South Carolina). More rarely, a hurricane from the Pacific to the west of Mexico, usually weakened, can affect the southwest (southern California, Arizona, New Mexico). However, in June hurricanes are still very rare, and the period in which they are most likely is from August to October.
The United States is located at medium latitudes, however, in June the days are long, especially in the north, where they last almost 16 hours a day. June 21, the summer solstice, is the longest day in the Northern Hemisphere.

The sea is warm enough for swimming in the Gulf of Mexico, in Florida and in the southern states of the Atlantic coast up to Virginia. Instead, to the west, on the Pacific Ocean, the sea is cold even in California, due to the aforementioned cold sea current.


See also: United States, the weather in May - July
The climate of United States