On the regional scale, the CEI for the Northeast, Upper Midwest, South, and Northwest were each much above average. The USCEI is an index that tracks extremes (falling in the upper or lower 10 percent of the record) in temperature, precipitation, land-falling tropical cyclones, and drought across the contiguous U.S. On the national scale, extremes in warm maximum and minimum temperatures and one-day precipitation totals were much above average. Climate Extremes Index (USCEI) for autumn was 50 percent above average and the 10 th highest value on record.
maximum (daytime) temperature was 68.6☏, 2.8☏ above the 20 th century average, the fourth warmest on record and warmest since 1999. Florida tied its warmest autumn on record with a statewide temperature of 75.5☏, 3.6☏ above average. Forty-one states across the Rockies, Great Plains, Midwest, Northeast, and Southeast were much warmer than average. and Alaska had an above-average autumn temperature. Every state across the contiguous U.S.
This surpassed the previous record warm autumn of 1963 which had a temperature of 56.6☏. average temperature was record warm at 56.8☏, 3.3☏ above the 20 th century average. The September-November contiguous U.S.January-November 2015 Statewide Temperature and Precipitation ranks