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

NCDC 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 2.60%
1911 2.40%
1912 13.20%
1913 0.00%
1914 12.00%
1915 23.50%
1916 11.10%
1917 2.10%
1918 4.30%
1919 2.10%
1920 11.30%
1921 2.30%
1922 4.50%
1923 0.00%
1924 8.30%
1925 2.30%
1926 10.90%
1927 6.70%
1928 16.50%
1929 25.10%
1930 2.30%
1931 2.00%
1932 18.80%
1933 12.80%
1934 6.10%
1935 2.10%
1936 26.70%
1937 4.50%
1938 8.50%
1939 6.30%
1940 6.00%
1941 8.60%
1942 6.00%
1943 20.90%
1944 17.20%
1945 10.90%
1946 6.40%
1947 12.70%
1948 13.20%
1949 2.20%
1950 10.40%
1951 6.60%
1952 2.00%
1953 8.30%
1954 2.00%
1955 12.00%
1956 8.30%
1957 8.00%
1958 6.00%
1959 8.50%
1960 6.30%
1961 16.50%
1962 6.20%
1963 8.90%
1964 38.40%
1965 8.70%
1966 8.40%
1967 8.40%
1968 2.20%
1969 13.10%
1970 6.50%
1971 2.10%
1972 10.90%
1973 4.70%
1974 2.20%
1975 10.60%
1976 6.50%
1977 10.00%
1978 6.60%
1979 24.70%
1980 8.30%
1981 6.10%
1982 8.80%
1983 23.50%
1984 16.80%
1985 18.60%
1986 10.30%
1987 2.10%
1988 6.20%
1989 6.60%
1990 16.90%
1991 14.70%
1992 12.70%
1993 2.10%
1994 12.00%
1995 23.60%
1996 8.40%
1997 10.50%
1998 29.40%
1999 22.80%
2000 4.10%
2001 10.40%
2002 17.00%
2003 8.60%
2004 15.40%
2005 14.10%
2006 19.20%
2007 11.60%
2008 13.50%
2009 13.00%
2010 22.10%
2011 12.10%
2012 2.90%
2013 30.10%
2014 19.10%

*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.