July 2026 Was the Hottest Month Ever Recorded in the Contiguous United States
July 2026 was the hottest month ever recorded in the contiguous United States, surpassing all previous monthly records in 132 years of continuous measurement. NOAA's National Centers for Environmental Information reports a contiguous-US average temperature of 76.9°F for the month, 3.3°F (1.8°C) above the 20th-century baseline. The record eclipses previous July highs set during the Dust Bowl in 1936 and again in July 2012. US monthly temperature records begin in 1895. NOAA NCEI
The heat was geographically pervasive. Every state in the contiguous US ranked in the warmest third of its own July temperature record, with none falling near or below average. Thirteen states recorded top-five warmest Julys. Wyoming stood out: its July 2026 temperature averaged 5.1°F (2.8°C) above normal, 0.9°F warmer than its previous July record set in 2007, making it both the state's warmest July and warmest month of any name on record. NOAA NCEI
The character of the heat skews strongly toward nighttime warmth. Overnight minimum temperatures across the contiguous US averaged 64.2°F, 3.7°F above the 20th-century mean and the warmest monthly average low on record, surpassing July 2022 by 0.7°F. Daytime maximum temperatures, while elevated, averaged 89.5°F (2.9°F above average) and ranked only sixth-warmest. That asymmetry matters: elevated nighttime lows reduce the thermal recovery window for human health, agriculture, and energy systems, compounding cumulative heat stress even when peak daytime readings fall short of all-time marks. NOAA NCEI
Although July 2026 set the monthly average record, the contiguous-US record for maximum daily temperatures still belongs to July 2024. The distinction between sustained monthly heat and extreme daily spikes is one climatologists draw carefully; a record monthly average reflects persistent warmth across both day and night rather than a single anomalous event.
Three distinct heat dome events settled over the contiguous US during the month, according to NOAA data. Heat domes, high-pressure systems that trap warm air beneath a stagnant atmospheric lid, are a familiar mechanism in American summers, but their sequential occurrence within a single month contributed to the sustained temperature anomalies that drove the record. The Guardian
Precipitation lagged as well. The contiguous US averaged 2.55 inches of total precipitation in July, 0.23 inch below the 20th-century average, placing the month in the driest third of the 132-year record. Despite that below-average national figure, major flash flooding struck the Texas Hill Country and eastern New York, illustrating the well-documented dynamic in which a warmer atmosphere intensifies individual rainfall events even as overall monthly precipitation declines. NOAA NCEI
The non-contiguous states diverged sharply from the Lower 48 pattern. Alaska's average July temperature was 51.8°F, 0.9°F below its 1925–2000 baseline, its coldest July since 2008 and a reading in the coolest third of the state's 102-year record. Hawai'i averaged 69.4°F, 0.6°F above the 1991–2020 normal, landing in the middle third of its 36-year record. The contrast underscores that the contiguous-US record reflects a specific synoptic pattern rather than a uniform global signal. NOAA NCEI
The broader context here is a sustained warming trend that long predates this single month. As of March 2026, the contiguous US had recorded its warmest 12-month span in the 1895 record. February 2026 averaged 40.4°F, 6.6°F above the 20th-century mean, the second-warmest February on record. NOAA global monitoring for June 2026 documented temperature departures of 2.0°C (3.6°F) or higher across the contiguous US, the Arctic, parts of Asia, and the North Pacific. NOAA NCEI The July record, in other words, arrives on the back of months of persistent anomalies across both continental and oceanic domains.
Looking at what this means for the trajectory ahead: July 2026 now supersedes two benchmark years that have anchored American climate discourse for decades. The 1936 Dust Bowl July has long served as a reference point for extreme continental heat, and its displacement by a margin of this magnitude narrows the rhetorical gap between historical analogues and the current warming trend. The record-warm overnight minimums, in particular, carry operational consequences for grid planners, public-health agencies, and agricultural managers that extreme daytime records alone do not. When nighttime cooling fails to materialize, cooling demand persists around the clock, livestock and crop heat stress accumulates without relief, and vulnerable populations face prolonged exposure. The fact that the daily maximum record still belongs to 2024 also suggests that the climate system's monthly averages are now climbing faster than its acute single-day extremes, a pattern consistent with the broader literature on shifting temperature distributions and reduced diurnal range.
