U.S. Climate Extremes Index (CEI)

Graph

Choose a period/season and an indicator from the options below and click "Plot" to create a time series graph. Note that the sixth indicator (Step 6) is not calculated for the spring (March-May), winter (December-February) and cold (October-March) seasons since most months during these periods are outside of the traditional hurricane season.



Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.

Download: Warm Data | Cold Data
Year Warm Cold
1910 6.20% 8.40%
1911 19.10% 18.50%
1912 0.40% 51.90%
1913 2.30% 16.80%
1914 3.60% 6.40%
1915 1.80% 7.40%
1916 0.80% 46.40%
1917 0.00% 71.20%
1918 1.90% 6.10%
1919 2.70% 15.30%
1920 0.40% 12.50%
1921 43.70% 0.40%
1922 11.50% 14.80%
1923 2.50% 9.00%
1924 0.00% 62.00%
1925 10.80% 0.60%
1926 7.30% 11.20%
1927 15.40% 4.30%
1928 1.70% 2.10%
1929 0.20% 40.10%
1930 0.10% 9.70%
1931 34.30% 1.10%
1932 2.80% 12.20%
1933 16.40% 6.80%
1934 37.00% 3.00%
1935 2.90% 4.80%
1936 1.80% 10.40%
1937 0.20% 5.20%
1938 16.00% 0.20%
1939 3.00% 0.70%
1940 18.70% 26.30%
1941 28.00% 0.90%
1942 0.00% 5.50%
1943 1.00% 6.00%
1944 0.30% 9.90%
1945 0.50% 3.20%
1946 11.20% 2.40%
1947 0.30% 3.30%
1948 0.80% 15.20%
1949 13.50% 20.90%
1950 0.40% 28.80%
1951 0.00% 25.80%
1952 0.80% 5.10%
1953 9.60% 2.30%
1954 12.60% 0.30%
1955 0.00% 19.40%
1956 0.20% 4.80%
1957 6.20% 0.50%
1958 14.10% 13.50%
1959 0.90% 1.30%
1960 0.00% 11.90%
1961 0.30% 7.40%
1962 0.20% 3.70%
1963 2.20% 24.60%
1964 0.00% 14.40%
1965 0.20% 1.90%
1966 0.00% 18.30%
1967 1.70% 7.20%
1968 0.00% 18.30%
1969 0.80% 7.20%
1970 0.30% 3.90%
1971 0.00% 5.10%
1972 0.00% 4.20%
1973 18.40% 5.20%
1974 0.40% 1.60%
1975 0.60% 12.50%
1976 0.00% 42.40%
1977 2.00% 0.70%
1978 1.90% 28.30%
1979 1.00% 31.50%
1980 1.30% 0.70%
1981 30.20% 7.00%
1982 1.00% 2.80%
1983 12.30% 7.10%
1984 1.70% 2.30%
1985 0.50% 17.90%
1986 37.30% 0.00%
1987 25.00% 1.90%
1988 1.30% 11.10%
1989 0.80% 13.40%
1990 23.40% 0.60%
1991 27.20% 0.00%
1992 15.50% 0.20%
1993 0.30% 6.70%
1994 9.80% 0.30%
1995 15.10% 0.00%
1996 11.10% 12.60%
1997 11.60% 1.10%
1998 75.80% 0.00%
1999 29.70% 0.70%
2000 19.90% 0.30%
2001 33.40% 0.00%
2002 18.20% 0.60%
2003 31.90% 0.00%
2004 29.30% 0.00%
2005 36.30% 0.00%
2006 48.50% 0.30%
2007 28.30% 0.00%
2008 2.60% 2.10%
2009 3.20% 0.80%
2010 22.20% 0.80%
2011 16.90% 0.90%
2012 79.60% 0.10%

View CEI Data Files

Limitations: Statistics for the most recent period/season are computed from a fraction of the U.S. which has data available at that time. Extreme percentage values can and will likely change as final quality controlled data become available and fill in the data gaps.