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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April Very Warm: Very Cold:
1895 15.61% 0.19%
1896 32.87% 10.12%
1897 0.42% 0.00%
1898 6.16% 17.41%
1899 0.38% 2.39%
1900 10.60% 8.51%
1901 0.00% 22.27%
1902 5.38% 1.59%
1903 0.00% 3.07%
1904 0.80% 30.37%
1905 0.00% 3.54%
1906 8.15% 0.00%
1907 0.00% 52.42%
1908 14.24% 1.35%
1909 0.00% 26.35%
1910 28.23% 0.84%
1911 0.74% 5.64%
1912 1.28% 14.77%
1913 1.04% 4.08%
1914 0.00% 2.67%
1915 45.75% 1.64%
1916 0.00% 4.74%
1917 0.00% 20.14%
1918 0.00% 20.54%
1919 0.00% 0.45%
1920 0.00% 55.85%
1921 13.07% 0.47%
1922 7.35% 19.73%
1923 0.00% 1.71%
1924 0.00% 0.47%
1925 49.84% 0.45%
1926 17.77% 37.30%
1927 14.43% 1.17%
1928 0.00% 37.26%
1929 11.60% 9.94%
1930 40.99% 0.00%
1931 1.97% 13.41%
1932 0.00% 0.42%
1933 0.00% 9.66%
1934 30.22% 0.00%
1935 0.00% 7.78%
1936 2.25% 18.49%
1937 0.00% 0.00%
1938 0.00% 0.00%
1939 6.06% 3.93%
1940 0.35% 9.13%
1941 21.08% 10.87%
1942 15.58% 0.00%
1943 31.05% 9.69%
1944 0.00% 15.81%
1945 12.13% 13.60%
1946 43.16% 0.00%
1947 5.65% 1.16%
1948 42.22% 4.54%
1949 9.37% 4.21%
1950 0.00% 38.19%
1951 0.17% 12.02%
1952 6.87% 6.99%
1953 0.00% 23.34%
1954 53.67% 2.18%
1955 48.31% 13.79%
1956 0.00% 10.29%
1957 4.82% 3.29%
1958 0.00% 2.88%
1959 5.90% 3.11%
1960 6.03% 0.00%
1961 0.00% 33.49%
1962 9.71% 4.51%
1963 16.36% 11.54%
1964 0.67% 0.53%
1965 13.19% 1.16%
1966 1.45% 10.89%
1967 27.26% 23.68%
1968 4.20% 6.20%
1969 4.02% 0.00%
1970 4.14% 35.74%
1971 0.00% 0.89%
1972 8.80% 9.81%
1973 0.00% 28.51%
1974 0.16% 0.00%
1975 0.00% 59.97%
1976 3.60% 0.00%
1977 27.51% 0.00%
1978 4.07% 0.00%
1979 0.00% 3.81%
1980 8.88% 2.32%
1981 53.61% 0.00%
1982 0.45% 23.04%
1983 0.00% 63.05%
1984 0.23% 10.80%
1985 23.31% 0.00%
1986 15.50% 0.75%
1987 42.42% 10.21%
1988 0.25% 0.00%
1989 25.44% 0.00%
1990 19.17% 0.00%
1991 18.42% 0.00%
1992 27.32% 0.38%
1993 0.46% 18.18%
1994 7.14% 0.00%
1995 0.24% 8.04%
1996 1.08% 5.17%
1997 0.00% 49.78%
1998 5.10% 4.74%
1999 15.36% 5.54%
2000 24.36% 1.22%
2001 23.28% 0.00%
2002 32.62% 0.00%
2003 1.16% 1.83%
2004 4.39% 0.40%
2005 10.04% 2.67%
2006 67.01% 0.00%
2007 0.00% 12.29%
2008 6.74% 9.67%
2009 1.10% 0.00%
2010 32.21% 0.00%
2011 25.37% 8.34%
2012 43.64% 0.00%
2013 3.01% 23.02%
2014 1.61% 0.32%
2015 8.12% 0.00%
2016 12.34% 0.00%
2017 31.33% 0.00%