Alaska

Washington

Wyoming

Hawaii

Oregon

None

A world map showing volcanoes active between 1800 and 2020. Volcanoes are scattered globally, with notable concentrations in the western US, Mexico, Central America, the Andes, the Mediterranean, East Africa, Southeast Asia, and the Pacific Ring of Fire.

Time series map animation showing locations of significant volcanic eruptions from 1800 to 2019. Use timeline controls at bottom of the map to display data by time period.

Volcanoes

World

NOAA

Arizona

Utah

District of Columbia

Florida

Idaho

New Hampshire

Rhode Island

Vermont

Montana

Maine

North Dakota

Kentucky

Virginia

Delaware

Mississippi

West Virginia

Nebraska

Texas

Missouri

Louisiana

North Carolina

Alabama

New Mexico

Kansas

Wisconsin

New Jersey

South Carolina

Michigan

Connecticut

Pennsylvania

Colorado

Nevada

Massachusetts

Georgia

New York

Maryland

Oklahoma

Tennessee

California

Arkansas

South Dakota

Ohio

Indiana

Minnesota

Iowa

Illinois

A map highlights the average distribution of dew point temperatures in July across North America.

Average July dew points for the contiguous United States

Average Distribution of Dew Points, July (U.S.)

The lightest shade of green represents a dew point of 20 degrees Fahrenheit, seen in parts of the western United States. The light shade of green, indicating a dew point of 30 degrees Fahrenheit, covers areas such as parts of Idaho, Wyoming, Nevada, and Utah. Moving southward, the green shade representing 40 degrees Fahrenheit is visible in regions including parts of the mostly western United States, such as Montana, Washington, Oregon, New Mexico, and Arizona. The medium green shade represents the 50 degrees Fahrenheit range and is seen in the northern Midwest, including parts of North Dakota. The darker shade of green represents higher dew points, with 55 degrees Fahrenheit covering regions like South Dakota, central parts of Wisconsin, Chicago, and New York. The green color represents 60 degrees Fahrenheit and is widespread in the central to eastern United States, covering areas like Dallas, Texas, Iowa, Illinois, Virginia, and Washington D.C. The brown color represents 65 degrees Fahrenheit and is concentrated in the southeastern United States, covering regions such as Tennessee, Georgia, and the Carolinas. The darkest shade of brown represents dew points of more than 70 degrees Fahrenheit, seen in the Gulf Coast states, including Louisiana, Mississippi, Houston, Florida, and Miami.

Display by:	Volcanoes	Average Distribution of Dew Point Temperatures, July
	Volcanoes	20–29°F	30–39°F	40–49°F	50–54°F	55–59°F	60–64°F	65–70°F	More than 70°F
Alaska	1
Hawaii	3
Arizona			3.28%	52.5%	1.52%	4.55%	1.19%
Utah		4.62%	12.3%	1.60%	1.99%
District of Columbia							100%
Florida								15.7%	50.5%
Idaho			41.4%	1.00%
New Hampshire					51.0%	48.6%
Rhode Island						40.8%	3.92%
Vermont					67.8%	5.13%
Washington	2		1.69%	1.65%	13.3%
Wyoming	1	6.20%	1.64%	53.8%	3.89%
Montana			12.5%	64.6%	1.73%
Maine					1.90%	1.80%
North Dakota				7.69%	68.5%	22.9%
Kentucky							74.1%	25.9%
Virginia						5.66%	52.3%	20.9%	1.66%
Delaware							70.5%		28.7%
Mississippi								72.7%	26.9%
West Virginia						18.6%	7.46%
Nebraska				1.70%	23.3%	39.4%	35.0%
Texas					7.25%	23.2%	29.8%	25.4%	11.4%
Missouri							79.9%	3.80%
Louisiana								31.8%	67.8%
North Carolina						1.46%	1.28%	68.8%
Oregon	2		3.51%	53.1%	4.57%
Alabama								94.8%	3.85%
New Mexico			1.12%	55.1%	17.6%	5.37%
Kansas					1.72%	30.3%	60.6%	7.43%
Wisconsin					4.55%	71.2%	1.80%
New Jersey						35.4%	64.3%
South Carolina							1.35%	88.9%	5.34%
Michigan					3.53%	60.8%	2.65%
Connecticut						74.5%	20.0%
Pennsylvania					4.44%	3.41%	11.0%
Colorado			1.05%	16.7%	24.1%
Nevada		8.38%	55.6%	2.02%
Massachusetts					3.88%	49.9%	35.1%
Georgia							9.84%	70.8%	17.4%
New York				1.78%	9.58%	8.48%	1.26%
Maryland						12.3%	72.0%		14.7%
Oklahoma					2.09%	6.06%	3.01%	9.12%
Tennessee							3.53%	55.1%
California			2.22%	24.7%	1.17%	2.39%
Arkansas							7.28%	3.52%	1.05%
South Dakota				2.29%	26.1%	60.0%	10.8%
Ohio						36.5%	1.25%
Indiana						8.52%	84.6%	5.00%
Minnesota					16.6%	59.4%	18.8%
Iowa						3.40%	95.4%
Illinois						1.77%	78.7%	18.0%

MapMaster 3

Volcanoes