March 2026 delivered the warmest March on record for the contiguous United States (CONUS, or lower 48 states) in NOAA’s 132-year dataset (since 1895)—and by the largest temperature anomaly of any month in that entire record.

March 2026 was not just “warm”—it was historically, record-shatteringly hot for the U.S. by every major metric NOAA tracks. It underscores how a modestly warmer climate amplifies seasonal extremes, turning what would have been a notable heat wave into something unprecedented. Data are from the official NOAA National Centers for Environmental Information (NCEI) March 2026 National Climate Report, with supporting confirmation across independent analyses and media summaries of the same release.

Official NOAA NCEI numbers (released ~April 8–13, 2026)

National average temperature: 50.85°F (10.47°C).

Anomaly: +9.35°F (+5.19°C) above the 20th-century (1901–2000) March average. This beat the prior record anomaly of +8.9°F (set in March 2012) and marked the first time any U.S. month has exceeded +9°F above its long-term norm.

Daytime highs were even more extreme: +11.4°F above the March average (and ~0.9°F warmer than the typical April average).

• Record setters:
  • 10 states set all-time warmest March records: Arizona, California, Colorado, Idaho, Nevada, New Mexico, Oklahoma, Texas, Utah, and Wyoming.
  • 1,432 counties (over half the CONUS area, affecting ~one-third of the population) recorded their single warmest March day on record (data from 1950 onward).
  • Thousands of daily high-temperature records fell, especially during the mid-to-late March heat dome (peaking ~March 16–27).

The heat was most intense across the western and southwestern U.S., where a persistent “heat dome” brought summer-like conditions (90–104°F in places) weeks ahead of schedule. Every one of the 48 contiguous states ran warmer than normal.

In the full 132-year instrumental record, March 2026 stands alone: it is both the warmest March and the month with the single largest departure from normal in U.S. history. Satellite data (UAH lower-troposphere) independently confirmed record warmth over the lower 48 for March in its 48-year record.

This warmth capped an even longer streak: the 12-month period from April 2025 through March 2026 is now the warmest 12-month span ever recorded for the CONUS.

A large-scale, persistent high-pressure pattern (the heat dome) dominated the West and much of the interior.

While weather patterns always play a role in any single month, the background warming trend—tied to human-caused greenhouse gas increases—has raised the baseline temperature, making extreme early-spring heat events more likely and more intense.

Attribution studies of similar recent Western North American heat waves have found such extremes are now virtually impossible without the ~1.3°C of global warming observed to date.

March 2026 was also extremely dry in many areas (January–March 2026 was the driest three-month start to any year on record), raising early wildfire concerns in the West.

What the expert gets right

Heat dome as the driver: Yes, a persistent high-pressure system (heat dome) over the western and southwestern U.S. caused the extreme March 2026 warmth. It trapped hot, dry air, leading to temperatures 20–35°F (11–19°C) above normal in many areas, with peaks over 100–112°F in places like Arizona and California—unusually early for March.

1934 and 1936 context: The 1930s Dust Bowl era featured some of the most intense U.S. heat waves on record, especially in summer (June–August). Many all-time high-temperature records for individual days or states (particularly in the Plains and Midwest) were set then and still stand today. The warmest year in Phoenix, for example, was 1934. Summers in 1934 and 1936 were exceptionally hot and dry due to natural factors like ocean temperature patterns (Atlantic and Pacific anomalies) combined with severe drought and poor land management.

Heat domes and blocking patterns have occurred historically; they are not new.

March 2026 vs. 1934/1936: The 1930s extremes were primarily summer events (peak heat in July 1936, for instance), not March. Comparing a record-warm early spring month in 2026 to peak-summer Dust Bowl years is apples-to-oranges. NOAA data confirm March 2026 as the warmest March in the 132-year contiguous U.S. record, with a national anomaly of +9.35°F (+5.19°C) above the 20th-century average—the largest anomaly for any month in that dataset. Ten western states set all-time warmest March records.

National vs. regional: While some individual stations or short-term records in the West may echo 1930s values, the contiguous U.S. average for recent periods (including the 12 months ending March 2026) shows modern warmth exceeding most 1930s benchmarks when adjusted for the full year or season. The 1930s heat was largely regional (central U.S.) and tied to exceptional drought; it was not a globally synchronized signal like recent decades.

Urban Heat Island (UHI) and station changes: UHI has increased since the 1930s (up to several °C in cities like Phoenix), which would tend to inflate modern readings. However, official NOAA/NCEI datasets apply adjustments for station moves, time-of-observation biases, and instrumentation changes. Raw unadjusted data can show different rankings, but homogenized records (the standard for climate trends) account for this. Many 1930s records persist because they were extreme daily highs under specific conditions—not because every modern event is cooler.

Overall trend: U.S. temperatures have risen ~2–3°F since the early 20th century due to human-caused greenhouse gases, superimposed on natural variability. This raises the baseline, making heat domes produce hotter outcomes today. Attribution studies for similar Western heat events find them “virtually impossible” at this intensity without the background warming.

The heat dome was the immediate weather driver, just as in past events. But the magnitude—shattering March records by such a wide margin (first time any U.S. month exceeded +9°F anomaly), combined with the ongoing long-term warming trend—makes it stand out. The 1930s provide important historical context for natural extremes, but they do not negate the measured acceleration in recent decades or the role of elevated greenhouse gases in shifting probabilities and intensities.

The heat dome was a natural weather pattern — correct.

Some daily and annual records from the 1930s persist — also correct.

But framing March 2026 as “nothing new” or purely alarmist ignores that it produced the largest monthly temperature anomaly in 132 years of U.S. records, set dozens of new March-specific benchmarks across the West, and occurred against a clear long-term warming background.

Natural variability and human influence both play roles; the data show their interaction is pushing extremes further.

The Dust Bowl prompted major reforms: the Soil Conservation Service (now NRCS), shelterbelts (tree windbreaks), and better dryland farming techniques. These reduced vulnerability to future droughts.

In the context of today’s climate discussions (e.g., comparing 1934/1936 heat to March 2026’s record U.S. warmth): The 1930s extremes were real, regionally intense, and driven by natural ocean patterns + poor land management—not global greenhouse gases. Many individual daily/summer records from that era still stand, especially in the Plains. However, the 1930s warmth was not part of a sustained global trend like the post-1970s warming; it was more localized and amplified by the dust/soil feedback loop.

Today’s background warming (~1.1–1.5°C globally since pre-industrial) raises the baseline temperature, so the same weather patterns (like heat domes) now produce hotter outcomes. March 2026’s +9.35°F national anomaly was unprecedented for any month in 132 years of records—but it was an early-spring event, unlike the Dust Bowl’s peak summer heat/drought. Both eras show how drought + heat interact with land surfaces, but the drivers and global context differ.

The Dust Bowl remains a powerful case study of how human decisions can worsen natural variability—and why soil conservation and climate awareness matter.

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Update:

Les Hatton’s exact conclusions

“Is a 1.1°C Rise in a Century Unusual?” published in Science of Climate Change (Vol. 6.1).

The analysis is fully reproducible because it uses the publicly available EPICA–Vostok ice-core dataset (deuterium-based temperature proxy, century-sampled over ~800,000 years).

The Vostok Ice Core data contains numerous interesting features which can be confirmed by anybody as the data is open. We can conclude the following:

A rise of 1.1°C in a century is not unusual in the current interglacial. In fact 16% of the centuries since the end of the last Ice age show a rise at least as big as the current century and none of these could have been affected by anthropogenic action.

A rise of 1.1°C in a century would have been considered unusual any time more than 200,000 years ago. For some unknown reason nothing to do with us, the temperature has become more volatile in century on century changes in the last 200,000 years. Whether this is a physical effect or an artifact of isotopic smoothing with time is unknown although there is no evidence for the latter on the peaks of the last four interglacials. And there is an abrupt change in magnitude of about 4°C in between the last 5 interglacials and the preceding 4 which is atypical of a continuous smoothing process.

The current interglacial is nothing special. It is currently still more than 3°C cooler than the peak of the last one about 130,000 years ago (which was by assumption entirely free of anthropogenic effect) and the degree of variability in this data is much the same now as then.

Given then that a rise of 1.1°C is quite commonplace in this current interglacial and that none of the earlier occurrences could have been affected by anthropogenic activity, this raises the question of why we are trying to attribute the current rise to anthropogenic effects as if it was unusual.

https://doi.org/10.53234/scc202603/05

Click to access SCC-Vol.6.1-Hatton.pdf

Hatton’s data-driven approach is a useful reminder that climate has always varied, sometimes rapidly, on natural timescales. It challenges simplistic claims that any warming above a certain rate must be human caused. At the same time, it does not directly disprove a substantial anthropogenic contribution today — attribution studies (using models, fingerprints like stratospheric cooling, tropospheric warming, etc.) still play a role in quantifying that.

See also:

Shocking News: 3 Million Years CO2 Not Driving Temperatures