NOAA Cooling Degree Days (CDD) chart for the Contiguous United States shows CDD 1,446ºDf in 2023, and 1,600ºDf in 2024, ranking as the highest annual CDD in 1895–2024 — The indicated 30-yr 1995-2024 CDD trend +91.7ºDf per decade is 54% higher than the 30-yr 1985-2014 CDD trend +59.5ºDf per decade