U.S. Climate Extremes Index (CEI): Graph

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.

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: xml csv json
Year Percent
1910 8.90%
1911 4.60%
1912 10.50%
1913 18.40%
1914 0.00%
1915 12.90%
1916 4.30%
1917 8.70%
1918 10.80%
1919 11.00%
1920 2.40%
1921 4.40%
1922 8.60%
1923 6.90%
1924 0.00%
1925 0.00%
1926 4.50%
1927 2.20%
1928 7.10%
1929 17.70%
1930 4.40%
1931 4.30%
1932 8.60%
1933 8.40%
1934 8.30%
1935 2.20%
1936 20.50%
1937 8.80%
1938 10.70%
1939 0.00%
1940 4.10%
1941 14.70%
1942 16.20%
1943 10.30%
1944 19.60%
1945 8.20%
1946 0.00%
1947 4.20%
1948 6.70%
1949 0.00%
1950 6.20%
1951 10.60%
1952 12.30%
1953 6.70%
1954 0.00%
1955 6.10%
1956 8.20%
1957 4.20%
1958 6.00%
1959 2.20%
1960 14.90%
1961 16.90%
1962 4.20%
1963 10.30%
1964 34.30%
1965 0.00%
1966 4.10%
1967 6.30%
1968 0.00%
1969 24.00%
1970 8.50%
1971 15.40%
1972 4.20%
1973 20.60%
1974 4.30%
1975 8.40%
1976 13.10%
1977 12.10%
1978 15.20%
1979 20.90%
1980 21.20%
1981 6.50%
1982 6.80%
1983 14.30%
1984 18.50%
1985 3.90%
1986 10.50%
1987 10.20%
1988 6.40%
1989 6.20%
1990 11.00%
1991 6.10%
1992 6.40%
1993 12.40%
1994 25.10%
1995 6.40%
1996 8.40%
1997 4.10%
1998 26.50%
1999 0.00%
2000 10.10%
2001 14.90%
2002 8.30%
2003 19.00%
2004 8.80%
2005 11.30%
2006 11.10%
2007 24.90%
2008 2.20%
2009 9.20%
2010 11.30%
2011 9.40%
2012 10.50%
2013 12.90%
2014 21.00%
2015 0.00%

*As of September 2005, the fourth and fifth indicators are computed with data from one station per each grid box rather than multiple stations. This was done to eliminate many of the artificial extremes which resulted from a changing number of available stations over time. Therefore, the percentages in the step 4 and 5 graphs above will likely be significantly different from the percentages calculated prior to the changes implemented in September 2005.

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.