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
1911 16.00%
1912 14.60%
1913 14.50%
1914 19.20%
1915 11.00%
1916 15.70%
1917 8.40%
1918 8.50%
1919 13.80%
1920 16.20%
1921 12.10%
1922 18.70%
1923 11.30%
1924 5.70%
1925 11.10%
1926 9.30%
1927 8.90%
1928 11.20%
1929 5.20%
1930 7.90%
1931 13.40%
1932 9.30%
1933 7.70%
1934 10.60%
1935 11.20%
1936 8.00%
1937 9.40%
1938 10.20%
1939 5.30%
1940 5.70%
1941 7.10%
1942 12.90%
1943 10.70%
1944 7.70%
1945 6.20%
1946 4.40%
1947 9.40%
1948 4.40%
1949 8.10%
1950 7.20%
1951 9.50%
1952 9.90%
1953 10.20%
1954 15.80%
1955 4.40%
1956 9.20%
1957 3.40%
1958 6.20%
1959 3.90%
1960 8.20%
1961 7.60%
1962 7.40%
1963 6.90%
1964 3.60%
1965 11.50%
1966 9.80%
1967 9.30%
1968 2.70%
1969 5.70%
1970 13.90%
1971 7.80%
1972 6.20%
1973 13.40%
1974 13.40%
1975 3.80%
1976 10.90%
1977 6.60%
1978 7.40%
1979 4.20%
1980 12.20%
1981 11.60%
1982 11.40%
1983 16.40%
1984 11.80%
1985 9.40%
1986 13.50%
1987 7.40%
1988 5.00%
1989 7.10%
1990 6.90%
1991 13.90%
1992 9.00%
1993 8.60%
1994 6.90%
1995 15.30%
1996 21.20%
1997 18.50%
1998 10.10%
1999 21.10%
2000 6.70%
2001 10.10%
2002 13.20%
2003 11.20%
2004 8.20%
2005 9.00%
2006 20.10%
2007 23.20%
2008 16.60%
2009 14.10%
2010 13.30%
2011 12.80%
2012 17.00%
2013 7.30%
2014 7.90%
2015 9.60%
2016 22.20%

*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.