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| April |
|---|
| Very Warm: |
| Very Cold: |
| 1895 | 1896 | 1897 | 1898 | 1899 | 1900 | 1901 | 1902 | 1903 | 1904 | 1905 | 1906 | 1907 | 1908 | 1909 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | 1917 | 1918 | 1919 | 1920 | 1921 | 1922 | 1923 | 1924 | 1925 | 1926 | 1927 | 1928 | 1929 | 1930 | 1931 | 1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959 | 1960 | 1961 | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 17.81% | 35.28% | 8.75% | 12.18% | 1.98% | 12.10% | 1.60% | 11.44% | 0.00% | 1.85% | 0.49% | 7.55% | 1.15% | 13.40% | 0.00% | 30.21% | 1.68% | 1.54% | 1.70% | 0.00% | 46.81% | 0.00% | 1.13% | 0.00% | 0.00% | 0.00% | 13.65% | 7.89% | 0.00% | 0.00% | 50.57% | 16.91% | 14.55% | 0.00% | 15.02% | 39.72% | 2.31% | 0.09% | 0.00% | 27.92% | 0.00% | 2.96% | 0.00% | 0.15% | 5.32% | 0.62% | 21.50% | 17.31% | 29.77% | 0.45% | 12.99% | 45.03% | 6.92% | 43.29% | 11.69% | 3.19% | 1.31% | 9.32% | 0.86% | 53.57% | 47.63% | 0.00% | 6.19% | 0.00% | 5.35% | 6.55% | 0.00% | 6.39% | 17.74% | 3.21% | 12.63% | 2.34% | 27.85% | 4.87% | 5.88% | 3.61% | 0.00% | 9.40% | 0.00% | 0.11% | 0.00% | 3.74% | 32.02% | 5.73% | 0.00% | 10.71% | 53.82% | 0.45% | 0.00% | 0.23% | 26.03% | 18.29% | 42.50% | 3.48% | 26.90% | 18.80% | 14.54% | 27.90% | 0.46% | 9.37% | 0.00% | 2.11% | 0.00% | 5.43% | 13.62% | 22.55% | 22.09% | 33.28% | 1.93% | 4.60% | 9.42% | 65.12% | 0.46% | 5.55% | 0.44% | 29.39% | 21.99% | 43.16% |
| 1.90% | 9.83% | 5.95% | 20.55% | 3.08% | 5.76% | 28.67% | 2.07% | 4.32% | 33.63% | 0.77% | 0.00% | 58.36% | 1.15% | 25.35% | 0.00% | 6.27% | 17.38% | 0.00% | 2.04% | 1.20% | 4.68% | 23.49% | 22.04% | 0.00% | 55.35% | 3.36% | 17.79% | 0.81% | 2.38% | 0.08% | 35.92% | 1.15% | 43.02% | 10.25% | 0.16% | 13.41% | 1.02% | 11.34% | 0.23% | 9.30% | 18.63% | 1.07% | 0.00% | 4.25% | 10.51% | 10.02% | 0.00% | 10.90% | 18.67% | 20.02% | 0.17% | 2.35% | 4.60% | 4.65% | 37.71% | 12.29% | 6.80% | 21.97% | 2.32% | 13.52% | 11.45% | 4.19% | 2.75% | 2.71% | 0.00% | 33.20% | 4.98% | 11.47% | 1.76% | 1.36% | 11.34% | 23.92% | 5.82% | 0.59% | 34.07% | 1.27% | 10.05% | 31.47% | 0.00% | 59.38% | 0.00% | 0.00% | 0.37% | 3.81% | 4.09% | 0.00% | 26.53% | 61.03% | 12.26% | 0.00% | 1.01% | 13.13% | 0.00% | 0.16% | 0.00% | 0.00% | 2.45% | 20.02% | 0.00% | 11.96% | 10.57% | 49.24% | 5.31% | 3.76% | 3.40% | 0.00% | 0.00% | 2.93% | 1.00% | 4.06% | 0.00% | 13.90% | 9.67% | 0.21% | 0.22% | 7.06% | 0.00% |
The percentage areas of the contiguous United States are computed based on the climate division data set. Those climate divisions having the monthly average temperature in the top ten percent (> 90th percentile) of their historical distribution are very warm and those in the bottom ten percent (< 10th percentile) are very cold.
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http://www.ncdc.noaa.gov/temp-and-precip/uspa/index.php