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Extreme heat strikes 25 states
FOX Multimedia Reporter Sarah Alegre joins LiveNOW from FOX with an update on weather. 25 states are under dangerous heat conditions.
New data reveals that extreme heat was evident in nearly all U.S. states this past summer.
Climate Central gathered data from all 50 states from June through August, calculating each state’s average temperatures and "Climate Shift Index," which indicates how climate change has altered the frequency of daily temperatures in any location around the world, every day.
1 in 5 people on planet felt climate change influence
By the numbers:
According to Climate Central, at least one in five people on the planet felt a strong climate change influence every day from June to August 2025.
Cities in Europe and Asia topped the list of locations where the average person experienced the most unusual heat this season.
Utah had highest temperature difference from normal
Dig deeper:
In 48 U.S. states, the average person experienced at least 30 days of risky heat days – days with temperatures hotter than 90% of the temperatures recorded in a local area from 1991 to 2020. Heat-related health risks rise when temperatures climb above this local threshold.
More specifically, Utah experienced the greatest temperature difference from normal temperatures (2.3 degrees Fahrenheit) during the summer months. This was followed by Oregon, Colorado, Washington and Arizona.
Every state, with the exception of Oklahoma, California, Kansas and Maryland, experienced a seasonal above-average temperature difference from the normal.
Dangerous heat waves during summer months
Why you should care:
According to Climate Central, human-caused climate change is fueling dangerous heat waves for billions and making these events longer and more likely.
Exposure to extreme heat can cause serious but preventable heat-related illness and, in severe cases, fatal heat stroke. Heat hazards often have under-reported impacts on health, agriculture, water supplies and more.
Kids cool off amid the heat on a summer day. (Credit: Allen J. Schaben / Los Angeles Times via Getty Images)
From June to August 2025, severe heat waves hit Europe repeatedly, leading to the closure of over 1,350 schools in France and the banning of outdoor work in parts of Italy.
In Japan, over 10,000 people were hospitalized due to heat-related illnesses amidst heatstroke alerts issued in 19 prefectures. South Korea also felt the impacts of extreme heat, recording 21 tropical nights in July and reporting 19 heat-related deaths.
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Official figures on heat-related deaths will likely be released later in the year, but public health officials have already estimated that more than 400 people died from extreme heat this season in Maricopa County, Arizona, alone. In Europe, scientists predict that the heat caused approximately 2,300 deaths across 12 cities, with around 1,500 of those attributable to climate change.
The Source: The information for this story was provided by Climate Central’s report "People Exposed to Climate Change: June-August 2025" published on September 17, 2025. This story was reported from Los Angeles.