February 12th afternoon temperatures have been declining for a century.
The areal coverage of February 12th warmth peaked in 1938 and was at a low in 2010.
On February 12, 1938, Texas was 86°F, Florida was 83°F, Georgia was 81°F, Louisiana Mississippi and Oklahoma were 80°F, Alabama and Arizona were 79°F, Arkansas, Illinois, and Indiana were 78°F, Kansas, New Mexico, and South Carolina were 77°F, Colorado and Tennessee were 76°F, Kentucky and Nebraska were 74°F, and Missouri was 73°F.
If we experienced temperatures that warm now, experts would be 97% certain it was due to elevated atmospheric CO2 levels.
Read more at Real Climate Science
