In the last 25 years of the 20th century most major land regions experienced a summer warming trend, but the central U.S. cooled by 0.2–0.8 K. In contrast most climate projections using GCMs show warming for all continental interiors including North America. source
The observed lack of twentieth-century warming in the central United States (CUS), denoted here as the “warming hole,” was examined in 55 simulations driven by external historical forcings and in 19 preindustrial control (unforced) simulations from 18 coupled general circulation models (CGCMs).
In the central US
Is a Decline of AMOC Causing the Warming Hole
Mechanisms Contributing to the Warming Hole
Possible source of clouds causing cooling
Climate Central wrong as usual
Not found on Wikipedia