Alaska, Montana, North Dakota, South Dakota, Wyoming, Idaho, Oregon, Washington, Minnesota, Wisconsin, New Hampshire, Vermont, and Maine.

The highest temperature: Death Valley, California at 134 degrees Fahrenheit.

The lowest temperature: Prospect Creek, Alaska at -80 degrees Fahrenheit.

Alaska has the highest and lowest recorded temperatures in the United States. The highest recorded temperature in the US is 134 °F in Death Valley, California on July 10, 1913. The lowest temperature ever recorded in the US is -80 °F in Prospect Creek, Alaska on January 23, 1971.