The continental United States experienced its most abnormally hot month on record in March 2026, surpassing all previous monthly temperature anomalies, according to data released by the National Oceanic and Atmospheric Administration (NOAA).
March’s average temperature reached 50.85 degrees Fahrenheit, which is 9.35 degrees above the 20th-century average for the month — the largest departure from normal recorded in 132 years of data. This exceeded the previous record anomaly of 8.9 degrees set in March 2012. NOAA also noted that the average maximum temperature for March was 11.4 degrees above normal, surpassing average daytime highs typically seen in April.
During March 20 and 21, roughly one-third of the continental U.S. experienced extreme unseasonable heat that Climate Central described as nearly impossible without the influence of human-driven climate change. Meteorologist Guy Walton analyzed NOAA data and reported that more than 19,800 daily heat records were broken nationwide, and over 2,000 locations set monthly heat records — a scale of record-breaking not seen in decades.
Scientific experts highlighted the significance of these temperature anomalies occurring on the heels of the hottest winter ever recorded for the contiguous U.S., coupled with the driest January through March period on record. Meteorologist Jeff Masters noted that this combination poses serious challenges for water availability, agriculture, river levels, and navigation.
Why it matters
This record-breaking heat contributes to growing concerns about the accelerating impacts of climate change on regional weather patterns and natural resources. The intensity and frequency of such anomalies underscore the pressure on ecosystems and communities, particularly amid ongoing drought conditions.
Experts are also closely monitoring the development of a “super” El Niño event forecast by NOAA and European climate agencies. Expected to reach strengths above 2 degrees Celsius of ocean warming, this El Niño episode is projected to increase global temperatures significantly later in 2026 and into 2027. Such events can also shift climate patterns for years, potentially exacerbating heat extremes and influencing hurricane activity.
Background
El Niño is a cyclical warming of central Pacific Ocean waters that redistributes heat and alters global weather. When strong, it raises global average temperatures, often setting new heat records. The warming trend observed over recent decades, driven primarily by fossil fuel emissions, may be amplifying El Niño effects, though the scientific consensus on this connection is still developing.
The past decade has seen six of the ten most abnormally hot months on record in the U.S., reflecting a clear upward trend coinciding with global warming. The recent record-breaking March temperature anomaly adds to mounting evidence of shifting climate baselines and more frequent extreme weather events.
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