OMAHA, Neb. — During a punishing early September heat wave that pushed afternoon temperatures into the mid-90s Fahrenheit and trapped overnight lows stubbornly in the 70s, Pat Wilson-Johnson sought refuge at the Salvation Army’s North Corps Community Center.
The community center doubles as a cooling center during high-heat advisories, offering a brief sanctuary from the oppressive climate. For Wilson-Johnson, who grew up in Omaha, the current weather bears little resemblance to the summers of her youth. She vividly remembers cool summer nights when opening a window brought in a refreshing evening breeze. Today, she said, opening a window does nothing more than invite in thick, suffocating humidity.
"Nine o’clock at night, it’s still 90, 91 degrees. That’s not right," Wilson-Johnson said.
Her experience highlights a growing, yet frequently overlooked, climate crisis across the Midwest and the United States: minimum temperatures are shooting up, creating a relentless overnight threat to human health, livestock, and vital agricultural yields. While daytime heat consistently dominates headlines, experts warn that the true danger lies in the lack of nighttime relief.
At the North Corps Community Center, Scott Harris watches the daily reality of this weather unfold. Many visitors arrive for a hot lunch, then transition to the lobby, where they sit for hours to cool down and rehydrate. Before they step back out into the sweltering afternoon, staff hand out bags of ice to help them combat the heat on their journeys home.
Similar scenes play out across the state. The Siena Francis House, a prominent Omaha nonprofit serving individuals experiencing homelessness, operates another vital cooling center during heat advisories. While the facility is typically open from 11 a.m. to 4 p.m., Kristy McKern, director of case management and permanent supportive housing, noted that the organization maintains flexible staffing and emergency protocols to provide essential resources outside of normal operating hours when the danger is acute.
Further west in Lincoln, the Lincoln-Lancaster County Health Department established an extreme heat response plan over a year ago. While initial efforts heavily prioritized soaring daytime temperatures, a department spokesperson confirmed that officials are now actively incorporating nighttime temperature data into their strategies. Currently, the Lincoln area relies on a single overnight cooling center to shelter vulnerable residents after dark.
The geographical shift in climate patterns is stark. According to Eric Hunt, an agricultural meteorology and climate resilience extension educator at the University of Nebraska-Lincoln, the state’s minimum temperatures are climbing rapidly. In the coming decades, baseline nighttime temperatures in Nebraska could regularly hover in the low 70s—resembling the typical summer climate of southeast Kansas or southern Missouri rather than the traditional High Plains.
This atmospheric shift carries severe implications for human health. Jesse Bell, director of the University of Nebraska Medical Center’s water, climate, and health program, explained that sustained high heat places immense physiological stress on the cardiovascular, renal, and respiratory systems, while also taking a heavy toll on mental health.
Importantly, these elevated nighttime temperatures do not affect everyone equally. The burden falls disproportionately on the elderly, individuals with pre-existing health conditions, people taking specific medications, outdoor workers, student athletes, individuals experiencing homelessness, and those without access to reliable, working air conditioning.
To counter these risks, outreach teams from the Siena Francis House and partnering organizations travel across Omaha during severe heat waves, distributing bottled water, snacks, and sunscreen directly to vulnerable populations living outdoors. Many of these individuals struggle with mental health challenges or substance abuse issues that compound their vulnerability.
"A lot of these people don’t have access to just the essentials like you and I would have," McKern said. "So again, for us to be able to provide those things to them, so they don’t end up in the hospital, or they don’t end up dehydrated or passing out or fainting."
According to data from the National Weather Service, more people die from heat-related causes in the United States on average than from any other weather event. Yet the consequences extend far beyond medical emergencies and fatalities.
Even when heat does not prove fatal, it inflicts a widespread, chronic toll on daily life, most notably through sleep disruption. A report organized by Climate Central estimates that residents in Omaha and Lincoln lost roughly 30 hours of sleep annually between 2020 and 2025 due to elevated temperatures, with approximately three of those lost hours directly attributable to human-driven climate change.
For households with air conditioning, persistent nighttime heat translates directly into skyrocketing utility bills. Families living in low-income housing, older homes, or unweatherized buildings face disproportionate financial and physical hardship during prolonged heat waves as cooling systems run continuously.
According to the U.S. Energy Information Administration, air conditioning accounts for a massive share of electricity consumption by residential and commercial customers. Energy demand climbs steadily throughout the day alongside rising temperatures, typically peaking around 5 or 6 p.m. However, as nighttime temperatures remain elevated, residential and commercial cooling units are forced to work harder for longer periods, driving up overall grid demand.
This surge coincides with mounting pressure on regional utility companies from commercial power users, such as rapidly expanding data centers. To maintain grid stability and meet surging demand, some utility operators have found themselves relying on fossil fuel generation to keep the lights—and the air conditioners—running.
Beyond Nebraska’s growing urban centers, climbing nighttime temperatures present an immediate economic and operational crisis for agriculture, the state’s foundational industry.
Higher nighttime lows disrupt the physiological processes of corn and soybeans, Nebraska’s two primary crops. Instead of resting and storing energy during the cooler dark hours, crops use up energy, which directly impairs overall development. George Graef, a professor of agronomy and horticulture at UNL who specializes in soybean breeding and genetics, noted that depending on the timing, duration, and intensity of a heat wave, elevated nighttime temperatures can lead to smaller seeds, fewer seeds, and reduced biomass for soybeans.
For corn, the damage is equally pronounced. Successive days and nights of high heat cause crops to essentially shut down, cutting short the critical grain-filling period in late summer and early fall by a week or more. Tom Hoegemeyer, a retired UNL agronomy and horticulture professor, warned that this premature shutdown significantly impacts final crop yields.
In the short term, farmers face the compounded threat of drought alongside nighttime heat, which drives up the intensive use of groundwater for irrigated agricultural production. Furthermore, hot, humid nights create ideal conditions for fungi and bacteria to proliferate, forcing producers to apply higher volumes of chemical protectants to safeguard their harvests.
While the scientific and agricultural communities are actively working to adapt, long-term optimism is tempered by the severity of climate projections. Graef noted that the soybean industry is leveraging modern technology and breeding techniques to develop new crop variants capable of tolerating shifting conditions, expressing confidence that solutions will be found.
However, researchers who have spent decades studying corn adaptation are less certain about the future. Hoegemeyer pointed out that while the corn industry has successfully adapted crops to handle warmer conditions over the past thirty years, the pace of future warming may outstrip scientific capability.
"If you believe the projections as to what temperatures will be like, say, by 2100, we may not be able to do that," Hoegemeyer said. "There are limits to what we can do with genetics and technology."
Livestock production—including cattle, pigs, and poultry—represents another cornerstone of Nebraska’s agricultural economy. The combination of rising nighttime temperatures and increasing humidity across eastern and central Nebraska poses severe animal welfare and productivity challenges.
"The effects of heat stress overall tend to affect larger, more productive animals the most," said Rick Stowell, a UNL professor and animal environment extension specialist. "So, if you think about heavy animals, mature animals, fat cattle and a sow, for example, or a high-producing dairy cow, they are generating a lot more body heat, and so they have a lot more heat to get rid of."
To mitigate these risks, livestock producers have increasingly invested in infrastructure improvements. Over the past two decades, Stowell has observed a significant rise in the construction of shade structures across feedlots. Producers are also upgrading building ventilation systems, adjusting feeding schedules to cooler times of the day, and utilizing water sprinklers to cool both the animals and the feedlot ground.
"Most livestock producers and poultry producers in eastern Nebraska are well aware that the situation is getting more challenging," Stowell said.