July was the hottest month recorded in the United States since record-keeping began in 1895, according to data released Monday by the National Oceanic and Atmospheric Administration (NOAA). The month’s average temperature across the Lower 48 states was 3.3 degrees Fahrenheit above the 20th-century average. This surpassed previous records set in July 1936 and July 2012 by approximately 0.1 to 0.2 degrees.
The record heat was driven by persistent heat domes—atmospheric conditions that trap hot air—from the East Coast to the Southwest. NOAA reported that 13 states experienced average monthly temperatures ranking in their top five warmest, with Wyoming recording its hottest month of any kind on record. While more than 600 monthly maximum and minimum temperature records were broken nationwide, fewer than 50 record lows were set during the same period.
Environmental factors cited by NOAA and research groups include long-term climate change caused by the burning of fossil fuels, which has increased the intensity and duration of heat waves. Additionally, an intensifying El Niño event in the Pacific Ocean contributed to rising global temperatures, though studies by World Weather Attribution indicated that individual heat waves were primarily driven by climate change and natural weather variability. The heat also contributed to wildfires in the Pacific Northwest and lowered water levels at Lake Mead to record lows.
The scale of the impact is evidenced by the depletion of critical infrastructure, such as Lake Mead, the nation's largest reservoir. The reservoir hit a record low level in early August, affecting the water supply for 20 million people across several Southwestern states. These individuals may face water usage restrictions or changes in water costs as the reservoir responds to drought and a lack of winter snowfall. Furthermore, homeowners and federal agencies are facing the immediate costs of wildfire suppression and property loss, as seen in Spokane, Washington, where hundreds of structures were damaged or destroyed in early August.
The broader implications involve a shift in national weather patterns that affects future policy regarding forest management and disaster relief. With July warming more rapidly than other months over the past few decades, federal and state agencies must account for longer-lasting heat waves when planning infrastructure. What happens next includes the monitoring of late-summer wildfires and ongoing water level assessments at Lake Mead. The immediate extreme weather conditions continued into early August, with record blazes reported in Washington and Oregon and ongoing heat waves in both the U.S. and Europe.