New Study: Extreme Heat Records, Heatwaves, Extreme Cold Records Declining Across US Since 1899
By Kenneth Richard on 27. April 2026
“The results indicate that extremes in heat-related metrics for daily T [Max] in the summer have not increased and in fact often show modest declines since 1899, due mostly to the early heat events during 1925-1954.” – Christy, 2026
The contiguous United States (CONUS) has the most reliable and comprehensive long-term daily maximum and minimum temperature records, with over 1,200 stations recording these data since the late 19th century.
It is often reported that extremes in hot and cold temperatures – and especially heatwaves – have been increasing in both frequency and intensity in the last few decades as a consequence of rising greenhouse gas concentrations.
However, reliable data from temperature stations across the CONUS indicate extreme heat, extreme cold, and heatwave duration and intensity have been declining since 1899, due mostly to the much higher extremes recorded during the 1925-1954 period.
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