Phoenix overnight lows are hotter than ever, and the trend is only going up – ABC15 Arizona

Phoenix overnight lows are hotter than ever, and the trend is only going up  ABC15 Arizona

Phoenix summers are known for brutal heat, but the nights are no longer offering much relief — and the data shows this year is among the worst on record for overnight lows.Since June 1, overnight lows in the Valley are averaging 84.5 degrees. There have been 14 nights that stayed below 80 degrees, 8 that climbed above 90, and 1 that exceeded 95.This summer ranks fifth hottest on record for overnight lows. The highest average summer low ever recorded was in 2024, at 87.5 degrees. Every one of the top five hottest summers for overnight lows has happened this decade.Year to date, Phoenix is living through the warmest average overnight temperature on record — 68 degrees.

That is 3 full degrees warmer than the second-warmest year on record, 2015.The five hottest overnight lows ever recorded in Phoenix are:97 degrees — recorded twice, once on the 24th and once on July 19, 202396 degrees — July 15, 200396 degrees — July 22, 202395 degrees — Aug. 12, 2003The long-term trend makes the pattern clear: Overnight lows are climbing. In 1982, the three-year average summer low was 81 degrees. Twenty years later, it had risen to 82.9 degrees. It has climbed another 3 degrees since then.The trend extends beyond the Valley. Flagstaff's three-year summer average overnight low has risen from 48.7 degrees