U.S. Percentage Areas (Very Warm/Cold, Very Wet/Dry)

Contiguous United States percentage area products are derived from standardized temperature and precipitation values, which are based on the U.S. Climate Divisional Dataset. Climate divisions with a standardized anomaly in the top ten percent (> 90th percentile) of their historical distribution are considered "very warm/wet" and those in the bottom ten percent (< 10th percentile) are classified as "very cold/dry". For more information please contact NCEI.Monitoring.info@noaa.gov.

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May Very Warm: Very Cold:
1895 0.00% 5.71%
1896 48.43% 16.96%
1897 28.12% 3.21%
1898 6.66% 3.78%
1899 19.70% 27.82%
1900 8.48% 1.49%
1901 11.50% 0.31%
1902 28.72% 4.63%
1903 0.54% 8.71%
1904 2.92% 0.22%
1905 11.72% 27.43%
1906 0.00% 5.04%
1907 0.00% 70.08%
1908 0.00% 27.08%
1909 0.00% 17.21%
1910 3.70% 19.06%
1911 19.75% 13.28%
1912 1.33% 1.75%
1913 1.57% 1.83%
1914 0.87% 2.59%
1915 4.79% 38.15%
1916 4.10% 19.90%
1917 0.00% 86.64%
1918 19.18% 12.20%
1919 3.34% 5.00%
1920 1.13% 10.46%
1921 0.00% 7.63%
1922 6.79% 0.00%
1923 0.00% 1.93%
1924 14.13% 59.99%
1925 11.30% 15.03%
1926 3.56% 3.00%
1927 15.27% 19.85%
1928 20.70% 3.15%
1929 0.00% 8.36%
1930 0.73% 16.23%
1931 9.21% 20.81%
1932 0.00% 0.08%
1933 20.58% 29.80%
1934 55.17% 0.00%
1935 0.00% 47.36%
1936 34.56% 0.55%
1937 1.86% 0.08%
1938 0.28% 0.04%
1939 21.56% 0.00%
1940 23.67% 4.08%
1941 14.94% 1.10%
1942 4.82% 10.50%
1943 5.00% 5.37%
1944 17.26% 1.16%
1945 0.00% 26.12%
1946 0.59% 6.63%
1947 22.21% 10.13%
1948 2.62% 3.22%
1949 5.04% 0.00%
1950 4.69% 15.39%
1951 0.00% 0.00%
1952 0.33% 0.87%
1953 13.28% 33.00%
1954 2.35% 41.86%
1955 9.99% 4.34%
1956 22.63% 4.11%
1957 3.04% 17.55%
1958 32.41% 1.94%
1959 17.33% 10.68%
1960 1.89% 2.96%
1961 0.00% 17.00%
1962 41.05% 4.41%
1963 12.00% 0.46%
1964 10.63% 3.47%
1965 17.29% 7.44%
1966 5.53% 12.26%
1967 0.00% 28.59%
1968 0.00% 12.52%
1969 14.30% 0.00%
1970 2.59% 3.11%
1971 0.00% 23.91%
1972 0.78% 3.80%
1973 4.43% 6.96%
1974 16.00% 9.99%
1975 8.04% 16.99%
1976 0.00% 29.07%
1977 29.24% 21.27%
1978 2.98% 0.02%
1979 0.12% 12.17%
1980 4.04% 10.20%
1981 0.00% 12.17%
1982 10.77% 0.00%
1983 0.87% 23.70%
1984 13.75% 3.34%
1985 6.69% 0.00%
1986 1.19% 0.00%
1987 36.12% 1.20%
1988 11.71% 1.52%
1989 9.88% 5.15%
1990 1.10% 0.87%
1991 33.23% 9.47%
1992 22.56% 15.96%
1993 10.01% 4.29%
1994 8.70% 9.45%
1995 3.83% 24.80%
1996 29.62% 9.39%
1997 18.22% 36.98%
1998 44.75% 10.22%
1999 1.83% 2.86%
2000 36.32% 0.00%
2001 26.50% 0.00%
2002 6.15% 5.54%
2003 16.18% 0.37%
2004 25.69% 0.83%
2005 2.09% 10.38%
2006 24.59% 0.00%
2007 12.77% 1.20%
2008 3.95% 1.61%
2009 22.87% 0.00%
2010 17.02% 24.89%
2011 4.73% 21.80%
2012 58.02% 0.00%
2013 1.06% 2.30%
2014 4.95% 0.25%
2015 15.56% 1.30%
2016 3.47% 0.00%
2017 2.73% 0.26%