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Scorching, long-duration heat wave to roast much of U.S.

Map showing computer model projection of heat and humidity combined on July 2, 2018.
Map showing a computer model projection of the "misery index" (heat plus humidity) on July 2, 2018. Credit: http://earth.nullschool.net

July is typically the hottest month of the year, for both the U.S. and the planet as a whole. However, this year it is going to start off particularly hot across the country, as a dangerous heat wave stretches from Arizona to Maine.

Why it matters: The heat and humidity will combine to create life-threatening conditions in many cities, particularly in the Midwest and Northeast, where heat advisories and excessive heat warnings are in effect.