Washington, D.C., is the capital city of the United States of America. "D.C." is an abbreviation for the District of Columbia, the federal district coextensive with the city of Washington. The city is commonly referred to as The District or simply Washington. Historically, it was called the Federal City or Washington City. To avoid confusion with the state of Washington, located in the Pacific Northwest, the city is often called simply D.C.

District of Columbia is in the northern periphery of the humid subtropical climate zone. The Climate of District of Columbia, USA is typical of the Mid-Atlantic U.S., with four distinct seasons. Summer tends to be hot and humid with daily high temperatures in July and August averaging about 30° to 33 °C.

The combination of heat and humidity makes thunderstorms very frequent in the summer, some of which occasionally produce tornadoes in the area. The combination of heat and humidity can also be reminiscent of a true tropical climate. Spring and fall are mild with high temperatures in April and October averaging about 20 °C. Winter brings sustained cool temperatures and occasional heavy snowfall, however, light snowfall is common. Average highs are 6 to 8 °C and lows -5 to -2 °C from mid-December to mid-February. Flooding of the Potomac River, however caused by a combination of high tide, storm surge, and storm runoff has been known to cause extensive property damage. Spring is generally the most favorable time of year, with low humidity, mild temperatures and blooming foliage.

This period generally lasts from late March until mid May. The average annual snowfall is 15 inches and the average high temperature in January is 5 °C; the average low for January is -3 °C.

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