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 20.50%
1911 12.80%
1912 11.50%
1913 15.20%
1914 7.10%
1915 7.70%
1916 6.60%
1917 6.10%
1918 6.10%
1919 11.00%
1920 4.00%
1921 13.40%
1922 0.00%
1923 19.30%
1924 13.10%
1925 6.40%
1926 3.50%
1927 3.70%
1928 6.70%
1929 29.70%
1930 10.00%
1931 3.10%
1932 10.00%
1933 3.10%
1934 3.20%
1935 9.80%
1936 6.80%
1937 10.30%
1938 6.70%
1939 3.30%
1940 10.30%
1941 6.30%
1942 0.00%
1943 17.40%
1944 13.70%
1945 3.40%
1946 6.40%
1947 13.50%
1948 6.80%
1949 9.80%
1950 13.30%
1951 13.80%
1952 6.50%
1953 10.20%
1954 3.20%
1955 13.10%
1956 0.00%
1957 3.20%
1958 6.90%
1959 6.40%
1960 10.00%
1961 0.00%
1962 3.20%
1963 6.30%
1964 13.10%
1965 6.30%
1966 9.60%
1967 13.10%
1968 10.20%
1969 3.40%
1970 12.80%
1971 9.60%
1972 0.00%
1973 6.90%
1974 6.30%
1975 3.40%
1976 3.20%
1977 3.20%
1978 7.20%
1979 10.20%
1980 16.80%
1981 3.40%
1982 17.30%
1983 3.20%
1984 12.80%
1985 10.00%
1986 6.60%
1987 13.30%
1988 7.30%
1989 6.60%
1990 6.30%
1991 6.10%
1992 3.40%
1993 9.70%
1994 16.80%
1995 9.60%
1996 3.30%
1997 13.50%
1998 13.40%
1999 3.30%
2000 3.30%
2001 7.00%
2002 3.60%
2003 3.30%
2004 3.30%
2005 6.90%
2006 25.20%
2007 28.70%
2008 31.20%
2009 0.00%
2010 3.70%
2011 14.60%
2012 7.80%
2013 4.60%
2014 16.40%
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.