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It's not just you: Summer is sticking around longer

Data: Climate Central; Map: Axios Visuals. Note: The 75th percentile temperature is based on the 1991-2020 reference period.Summer temperatures are hanging around longer nationwide compared to the early 1970s, a new analysis finds, as climate change affects the four seasons.Why it matters: Temperatures staying relatively high for longer periods can increase cooling demand, make life miserable for teachers and students in rooms without A/C, mess with farmers' growing seasons, and prolong the risk of heat-related illnesses.Longer summers also elevate the risk of wildfires by drying out vegetation and soil, creating more fuel for blazes.Driving the news: Summer temperatures are lingering compared to 1970 in just over 90% of the 246 U.S. cities analyzed in a new report from Climate Central, a climate research group.Among cities with lingering heat, summer temperatures are lasting an extra 10 days on average.Zoom in: Summer temperatures are lasting for the most extra days in Wheeling, West Virginia (52 more days compared to 1970); Miami (46 more days) and San Angelo, Texas (31 more days).The other side: Some cities show the opposite trend, including Myrtle Beach, South Carolina (11 fewer days); Washington, D.C. (8 fewer days) and Charlottesville, Virginia (8 fewer days).How it works: Climate Central's analysis is based on NOAA data, and reflects the last date each year with highs equal to or greater than historical summer-like temperatures.The group defined "summer-like temperatures" as the 75th percentile of daily highs during the 1991-2000 climate normal."In other words, summer-like temperatures represent the hottest quarter of the year during 1991-2020."What they're saying: "Research suggests that high future levels of heat-trapping pollution would cause summers to continue to stretch longer and later in the coming decades — putting health, ecosystems, and agriculture at risk," per the report.The group also highlights previous research showing that climate change is lengthening summers across the Northern Hemisphere.What's next: NOAA's seasonal outlook for September through November calls for above-normal temperatures for most of the country, especially in the Northeast, Southwest and much of Florida.

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