![Jay Janner FILE - Kristin Peterson tries to cool off with a cold bandana at Sonrise Homeless Navigation Center in Austin, Texas, on July 11, 2023. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (Jay Janner/Austin American-Statesman via AP, File)](https://mapi.associatedpress.com/v2/items/bc29ae83df564573921afc872ad45f8c/preview/preview.jpg?s=680x)
FILE - Kristin Peterson tries to cool off with a cold bandana at Sonrise Homeless Navigation Center in Austin, Texas, on July 11, 2023. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (Jay Janner/Austin American-Statesman via AP, File)
![Ross D. Franklin FILE - Patrons try to cool off inside at the Justa Center as temperatures are expected to hit 116 degrees Fahrenheit, on July 18, 2023, in Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Ross D. Franklin, File)](https://mapi.associatedpress.com/v2/items/714d1cacfb7e4d5f830105264e79c780/preview/preview.jpg?s=680x)
FILE - Patrons try to cool off inside at the Justa Center as temperatures are expected to hit 116 degrees Fahrenheit, on July 18, 2023, in Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Ross D. Franklin, File)
![Gregory Bull FILE - Juan Carlos Biseno sweats as he dances to music from his headphones as afternoon temperatures reach 115 degrees on July 19, 2023, in Calexico, Calif. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Gregory Bull, File)](https://mapi.associatedpress.com/v2/items/5da00a35fd2a48c5ae8484f500c0288c/preview/preview.jpg?s=680x)
FILE - Juan Carlos Biseno sweats as he dances to music from his headphones as afternoon temperatures reach 115 degrees on July 19, 2023, in Calexico, Calif. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Gregory Bull, File)
![Ross D. Franklin FILE - With hands covering their forehead, a person waits at a bus stop as temperatures are expected to hit 116 degrees on July 18, 2023, in Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Ross D. Franklin, File)](https://mapi.associatedpress.com/v2/items/e899a448fb344beb9e7c74158e4176df/preview/preview.jpg?s=680x)
FILE - With hands covering their forehead, a person waits at a bus stop as temperatures are expected to hit 116 degrees on July 18, 2023, in Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Ross D. Franklin, File)
![Matt York FILE - A man wipes his brow as he walks under misters, on July 13, 2023, in downtown Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Matt York, File)](https://mapi.associatedpress.com/v2/items/e4194bc2ff214e0895bb22b7109655b1/preview/preview.jpg?s=680x)
FILE - A man wipes his brow as he walks under misters, on July 13, 2023, in downtown Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Matt York, File)
![Matt York FILE - A digital billboard displays an unofficial temperature, on July 17, 2023, in downtown Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Matt York, File)](https://mapi.associatedpress.com/v2/items/8cde61385bc64a7595f4acd92876b60c/preview/preview.jpg?s=680x)
FILE - A digital billboard displays an unofficial temperature, on July 17, 2023, in downtown Phoenix. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Matt York, File)
![Matt York FILE - The unofficial temperature hits 108 degrees at dusk at Sky Harbor International Airport in Phoenix on July 12, 2023. Phoenix saw 20 consecutive days of extreme heat stress in July, the longest run of such dangerously hot days in the city since at least 1940, according to the data from the Copernicus Climate Change Service. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Matt York, File)](https://mapi.associatedpress.com/v2/items/1df73456bc154f8b9177fe2965453716/preview/preview.jpg?s=680x)
FILE - The unofficial temperature hits 108 degrees at dusk at Sky Harbor International Airport in Phoenix on July 12, 2023. Phoenix saw 20 consecutive days of extreme heat stress in July, the longest run of such dangerously hot days in the city since at least 1940, according to the data from the Copernicus Climate Change Service. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Matt York, File)
![Eric Gay FILE - Jessie Fuentes, who works providing people with canoes and kayaks, walks along the Rio Grande with the sun pushing the temperature into the 90s on July 6, 2023. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Eric Gay, File)](https://mapi.associatedpress.com/v2/items/b4b5277cb6244bfaa8764c94858da56b/preview/preview.jpg?s=680x)
FILE - Jessie Fuentes, who works providing people with canoes and kayaks, walks along the Rio Grande with the sun pushing the temperature into the 90s on July 6, 2023. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/Eric Gay, File)
![Jon Shapley FILE - A person crosses Caroline Street in the afternoon heat Saturday, May 25, 2024, near Discovery Green in Downtown Houston. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (Jon Shapley/Houston Chronicle via AP, File)](https://mapi.associatedpress.com/v2/items/c35dda42da1a40b1bc6e52d476c9361c/preview/preview.jpg?s=680x)
FILE - A person crosses Caroline Street in the afternoon heat Saturday, May 25, 2024, near Discovery Green in Downtown Houston. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (Jon Shapley/Houston Chronicle via AP, File)
![Lm Otero FILE - Police officer James Rhodes uses a wet towel to cool off as he directs traffic after a sporting event in Arlington, Texas, on Aug. 19, 2023. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/LM Otero, File)](https://mapi.associatedpress.com/v2/items/d85aa6c4fd4b4fdf81e8e2cbf7892bca/preview/preview.jpg?s=680x)
FILE - Police officer James Rhodes uses a wet towel to cool off as he directs traffic after a sporting event in Arlington, Texas, on Aug. 19, 2023. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/LM Otero, File)
![John Locher FILE - People walk along a trail as the sun sets, on July 16, 2023, in Death Valley National Park, Calif. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/John Locher, File)](https://mapi.associatedpress.com/v2/items/baf9bbadb3014ffca01409bfbe1f4a3d/preview/preview.jpg?s=680x)
FILE - People walk along a trail as the sun sets, on July 16, 2023, in Death Valley National Park, Calif. The death certificates of more than 2,300 people who died in the United States last summer mention the effects of excessive heat, the highest number in 45 years of records, according to an Associated Press analysis of Centers for Disease Control and Prevention data. With May already breaking heat records, 2024 could be even deadlier. (AP Photo/John Locher, File)