Birdnow's Aviary

April 26, 2026

John Christy Paper Shows Temperatures Moderating in U.S. since 1899

Timothy Birdnow

Suck on this climate cretins!

Declines in hot and cold daily temperature extremes in the conterminous US, 1899–2025

The climate models all say temperature extremes will become more pronounced, not less.

University of Alabama Huntsville climatologist John Christy, who won a Nobel along with others in the IPCC, penne this paper which knocks the stuffing out of the alarmist worldview.

Here is the abstract:

Abstract

Knowledge of temperature extremes, and their potential changes within a climate system of increasing greenhouse gases, is of vital interest for humans and the infrastructure which supports them. To produce a better understanding of how daily extreme temperatures have changed over time in the conterminous US (CONUS), the United States Historical Climate Network (USHCN) database was extended back to 1899 and forward to 2025. The original 1,218 stations, selected in the 1980s by NOAA as capable of addressing climate concerns, have since been neglected - almost half of the stations have closed since 2000. Incomplete station records were supplemented with nearby stations with high correlation and removeable biases to provide time series for 1,211 of the stations with at least 92% of data present. Extreme temperature metrics for summer daily maximum temperatures and winter daily minimum temperatures were calculated. The general result is that metrics for extreme summer heat, e.g., hottest values, number of heatwave days, etc., show modest negative trends since 1899. Extreme cold temperature metrics also indicate a decline in their occurrences especially since the 1990s. In sum, instances of both hot and cold extreme metrics have declined since 1899. To demonstrate an application of this dataset we examined the claims of one source regarding changing temperature extremes, The National Climate Assessment 5.

end

Of course one of the dirty little secrets is that warming from carbon dioxide would be most noticeable in diurnal temperatures; nighttime lows would be less than daytime. But the Gang Green pushes this idea that AGW would lead to more extreme temperatures all around and this pretty much splashes that claim.

So if summer extremes are down how do they claim "hottest year ever"? They look at the whole year, not just the summer, and then when in doubt they push current temps up and try to minimize previous temperature records. Of course these "hottest year on record" marks are statistical ties with multiple other years but once they get the "data smoothing" done it always comes out as hotter now than before.

But this suggests it ain't so because all the records should be showing an upward trend. They aren't.

So go suck eggs Climate kooks!

Posted by: Timothy Birdnow at 01:17 PM | No Comments | Add Comment
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