When the Climate Data Refuses to Cooperate with the Woke Narrative
For years the public has been told that heatwaves across the United States are becoming more frequent, more intense, and more dangerous as a direct consequence of human-driven climate change. Every summer's high-temperature events are presented as further proof of a climate system spinning beyond historical norms. The message is consistent, urgent, and rarely qualified by longer-term context. Yet a straightforward examination of the National Oceanic and Atmospheric Administration's own Global Historical Climatology Network daily records tells a more complicated story.
Meteorologist Chris Martz has analysed that publicly available dataset and found that the average number of days per year reaching 35°C was significantly higher in the period 1901–1960 than in 1961–2020. Days reaching the more extreme thresholds of 37.8°C and 40.6°C have not increased in recent decades; the long-term record since 1895 shows a decline rather than an acceleration.
The blistering heat of the 1930s Dust Bowl years stands out as particularly severe by these metrics, a historical reality that sits awkwardly with claims of unprecedented modern extremes.
This is not a matter of obscure alternative data or contested methodologies. The GHCNd is the same integrated database of daily station observations that underpins many official climate analyses. When the full historical series is examined rather than short-term snapshots or carefully selected recent events, the pattern of extreme heat days does not match the linear intensification story that dominates public messaging. The early-to-mid twentieth century produced more frequent punishing heat events across the contiguous United States than the later period that coincides with the sharpest rise in atmospheric carbon dioxide.
The discrepancy matters because narrative and policy both rest on the assertion of escalating extremes. If the most severe heat days were already more common before the bulk of modern industrial emissions, then the relationship between emissions and the frequency of those particular extremes is less straightforward than commonly asserted. Localised records, urban heat-island effects, and short-term variability can still produce memorable heatwaves in any given year. What the longer station record does not show is a relentless climb in the number of days that cross the highest temperature thresholds.
Selective presentation of data has long been a feature of climate communication. A single hot summer, a broken local record, or a carefully framed graph can create the impression of a system in continuous freefall. The fuller historical series acts as a corrective. It challenges the claim that the United States is experiencing steadily more frequent extreme heat of the kind that once characterised the first half of the twentieth century.
For those who prefer evidence over messaging, the numbers remain available for inspection. They do not show a climate descending into uncharted thermal territory measured by the frequency of the hottest days. They show a more complex history in which earlier decades already produced severe heat with regularity. When official datasets quietly contradict the most dramatic public claims, the honest response is not to ignore the data but to adjust the narrative to fit the record. The alternative is to keep insisting that every summer is worse than the last, even when the long-term counts of extreme heat days say otherwise.
