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

NCEI added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.

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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Download: xml csv json
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%