TL;DR
A study published in Nature Communications found that extreme heat and cold were associated with higher rates of deaths, infirmary admissions and outside medical transfers in Pennsylvania state prisons over 20 years. The researchers also found larger increases in infirmary visits and external medical transfers for incarcerated women after extremely hot days than for men. The findings raise concerns about aging facilities and strained prison health services, but do not establish that temperature caused individual outcomes.
A study published in Nature Communications found that extreme heat and cold were associated with higher rates of deaths, infirmary admissions and transfers to outside medical facilities among people in Pennsylvania state prisons over a 20-year period. Researchers also found that women had larger increases in infirmary visits and external medical transfers on and after extremely hot days than men, adding to concerns about the ability of aging facilities and strained health services to protect people in custody.
The study, led by epidemiologist Jaquelyn L. Jahn and colleagues, analyzed mortality and health-care use in Pennsylvania state prisons following extreme ambient temperatures. The authors report associations between very hot and very cold conditions and higher rates of deaths, infirmary admissions and off-site medical transfers. The reported findings describe patterns in the data; they do not establish that temperature alone caused any particular death or medical event.
One finding stood out to the researchers: after extremely hot days, women in the state prison system experienced greater increases in infirmary visits and transfers to external medical facilities than men. The researchers describe this as unexpected, noting that prior heat-risk research in the general population has not consistently found greater vulnerability among women. They suggest that incarceration-related stress and accelerated aging, along with menopause-related symptoms such as hot flashes and night sweats, may help explain the pattern, but those possibilities are not presented as proof of the mechanism.
The report places the findings against the conditions of Pennsylvania’s prison system. Nearly 40,000 people are confined in its prisons, and most facilities were built in the 1990s or earlier. Some institutions have air conditioning only in certain buildings or units, according to the report. The state’s population in prison is also aging, while correctional and medical staffing shortages can limit access to appointments and care.
Heat Risks for Women and Older Adults
The findings point to a health risk that can compound existing vulnerabilities in custody. People in prison cannot freely seek a cooler location, use an air conditioner or go to a public warming center during temperature extremes. That lack of control makes building conditions and access to timely care especially relevant when heat or cold places additional demands on prison operations.
The report says people in prison are more likely than the general population to have chronic conditions such as heart disease, and Pennsylvania’s prison population is getting older. It also describes how staffing shortages and movement restrictions can make it harder to reach medical appointments and other services. The study does not measure every way climate affects incarcerated people, but its findings make clear that temperature extremes coincide with higher recorded health-care needs in a system already facing constraints.
For women, the observed increases warrant attention because the researchers say prior studies have not consistently identified the same pattern in the general population. The finding does not mean every woman faces the same level of risk. It does suggest that heat preparedness and health planning should account for differences in the prison population rather than relying only on evidence drawn from people living outside custody.
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Aging Facilities and Rising Needs
Temperatures across Pennsylvania reached 103 degrees Fahrenheit and fell to minus 9 degrees during the period described in the report. The article says people in custody have for years raised concerns about oppressive heat in summer and bitter cold in winter, including when heating systems malfunction. Amy McBride, incarcerated at MCI Muncy, described wearing several layers during winter to the Prison Journalism Project.
Some state facilities—including Cambridge Springs, Dallas, Laurel Highlands, Muncy, Waymart and Huntingdon—have partial or limited air conditioning, according to the report. That can mean cooling is available in some buildings or units, such as nursing-care areas, but not throughout a facility. These details help explain why outdoor temperature extremes may matter inside prisons, though the study’s findings concern associations across the system rather than a facility-by-facility assessment of equipment.
The report also describes pressures on prison health care: the average age at admission rose from 31 in 2000 to 38 in 2023, and medical staff vacancies at some facilities have approached 40%. It says adults over 50 incur higher medication costs than younger incarcerated adults. Pennsylvania charges a $5 copay for some visits the Department of Corrections classifies as non-emergency, while prison wages cited in the report range from 23 to 50 cents an hour.
“The researchers found that extremely hot and cold temperatures were associated with higher rates of deaths, infirmary admissions and transfers to external medical facilities among imprisoned people in Pennsylvania over the past 20 years.”
— Jaquelyn L. Jahn and colleagues
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Limits of the Study Findings
The report describes statistical associations between extreme temperatures and health outcomes, but the material provided does not establish individual-level causation or detail how much risk changed for each temperature range. It also does not provide facility-specific estimates or identify which building upgrades would most reduce health harms.
The reason women showed larger increases in some measures after hot days remains uncertain. The researchers discuss accelerated aging and menopause-related symptoms as possible factors, but the findings do not confirm those explanations. The source material also does not specify what steps Pennsylvania officials have committed to take, whether particular facilities will receive cooling or heating upgrades, or how quickly any changes might occur.
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Prison Climate Planning Ahead
The researchers argue that preparing for more intense temperature extremes will require attention to prison conditions and health-care capacity, alongside policy efforts to reduce incarceration, particularly among older adults. The study does not announce a state implementation plan or a timetable for facility improvements.
Further reporting and official responses would clarify whether Pennsylvania will review cooling and heating systems, staffing, access to medical care and protections for people at heightened risk. For now, the study adds evidence for policymakers and prison administrators to weigh as they plan for extreme weather, while leaving the scale, cost and timing of any response unresolved.
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Key Questions
What did the Pennsylvania prison study find?
Researchers reported that extreme heat and cold were associated with higher rates of deaths, infirmary admissions and transfers to outside medical facilities among people in state prisons over 20 years.
What did the study report about women?
Women had larger increases in infirmary visits and external medical transfers on and after extremely hot days than men. The study does not confirm why the difference occurred.
Does the study prove extreme temperatures caused deaths?
No. The reported results show an association between temperature extremes and health outcomes. They do not prove that temperature caused any individual death or medical event.
Why are Pennsylvania prisons a concern during extreme weather?
The report says most state facilities were built in the 1990s or earlier, and some have partial or limited air conditioning. It also describes an aging prison population and shortages among correctional and medical staff.
Has Pennsylvania announced changes in response?
The source material does not identify a state response plan or a timetable for upgrades. The researchers call for climate resilience planning, but specific government actions remain unclear.
Source: rss
