ELECTRIC BLANKETS IN SUMMER: U.S. TOWNS WITH THE COLDEST
AVERAGE JULY NIGHTS
Interior Western United States high-elevation mountain valleys have
the coldest nights in summer relative to the rest of the United
States (outside of northern Alaska, of course). This is because of
the dry air that is typically in place (dew is less likely to condense
and release heat into the air), the low wind speeds that allow the
daytime heat to radiate out to space and the drainage of cold
air into the valleys. All towns listed here have at least 2,500
people, and some places have their official temperature readings just
outside of the city limits (like with South Lake Tahoe,
California--the airport is in a valley just south of town and also
away from the moderating effects of the lake).
1. Barrow, Alaska
2. Jackson, Wyoming
2. Leadville, Colorado
2. South Lake Tahoe, California
2. Vail, Colorado
6. Steamboat Springs, Colorado
7. Gunnison, Colorado
8. Ketchum, Idaho
9. Aspen, Colorado
9. Evanston, Wyoming
Source of Most Data: Western Regional Climate Center.
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