![]() ![]() The region’s highest temperatures tend to occur in June, before the monsoon’s clouds and rain set in. This early arrival reflects the influence of the North American Monsoon, a period of increased rainfall affecting the U.S. The lightest colors (earliest warmest day) occur in New Mexico and Arizona. The lightest and darkest areas of the map show just how variable the U.S. The continued warming occurs because the rate of heat input from the sun during the day continues to be greater than the cooling at night for several weeks past the solstice, until temperatures start to descend in late July and early August. The amount of solar radiation reaching Earth (in the northern Hemisphere) peaks at the summer solstice on June 21, but temperatures tend to keep increasing into July. The darker the color, the later in the year the hottest day typically arrives.įor most of the country, the warmest day occurs sometime between mid-July and mid-August. The colors show date ranges progressing from June 1 (lightest yellow) through September 30 (darkest red). Climate Normals, the nation’s official record of recent climate. This map shows the average window for the day of the year with the highest maximum temperature based on the 1981-2010 U.S. For another significant chunk of the country-including most of Alaska-the historical window for the hottest day of the year has already passed. If this year’s weather is statistically “normal,” most locations in the contiguous United States will experience their hottest day of the year between July 15-31.
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