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 6.80%
1911 2.70%
1912 5.40%
1913 0.00%
1914 2.30%
1915 9.50%
1916 22.80%
1917 2.40%
1918 8.40%
1919 10.10%
1920 9.70%
1921 4.70%
1922 10.10%
1923 0.00%
1924 2.40%
1925 9.40%
1926 12.20%
1927 7.70%
1928 12.00%
1929 0.00%
1930 4.60%
1931 11.80%
1932 0.00%
1933 11.40%
1934 7.00%
1935 2.40%
1936 20.60%
1937 0.00%
1938 8.70%
1939 16.30%
1940 20.60%
1941 4.60%
1942 6.60%
1943 9.40%
1944 2.40%
1945 13.80%
1946 9.90%
1947 6.90%
1948 7.00%
1949 13.80%
1950 9.00%
1951 6.80%
1952 9.20%
1953 11.20%
1954 15.20%
1955 17.60%
1956 7.00%
1957 13.80%
1958 0.00%
1959 22.80%
1960 6.70%
1961 13.70%
1962 7.00%
1963 6.70%
1964 16.10%
1965 11.70%
1966 13.50%
1967 13.20%
1968 9.30%
1969 6.60%
1970 11.20%
1971 9.40%
1972 20.80%
1973 2.30%
1974 9.00%
1975 9.10%
1976 4.60%
1977 4.50%
1978 11.80%
1979 4.40%
1980 20.20%
1981 18.10%
1982 9.20%
1983 18.10%
1984 11.10%
1985 13.40%
1986 11.00%
1987 6.80%
1988 15.60%
1989 11.40%
1990 8.90%
1991 16.00%
1992 9.30%
1993 11.20%
1994 9.10%
1995 25.40%
1996 11.20%
1997 11.60%
1998 11.60%
1999 18.00%
2000 4.80%
2001 9.10%
2002 4.50%
2003 9.30%
2004 9.60%
2005 18.20%
2006 18.80%
2007 5.30%
2008 23.20%
2009 0.00%
2010 9.40%
2011 17.20%
2012 8.50%
2013 14.30%
2014 8.10%
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.