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.

NCEI replaced input data for the CEI mean monthly maximum and minimum temperature extremes on Thursday, October 6, 2016, coincident with the release of the September 2016 monthly monitoring report. For more information on transition from USHCN to nClimGrid data, please visit the CEI - Data Used page.

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 23.32%
1911 25.84%
1912 35.30%
1913 18.50%
1914 19.18%
1915 20.92%
1916 27.58%
1917 34.04%
1918 10.30%
1919 19.76%
1920 18.06%
1921 26.94%
1922 18.88%
1923 18.86%
1924 30.38%
1925 12.68%
1926 18.34%
1927 20.76%
1928 11.30%
1929 25.94%
1930 14.46%
1931 26.90%
1932 13.24%
1933 23.56%
1934 38.86%
1935 11.64%
1936 18.16%
1937 12.58%
1938 17.56%
1939 20.22%
1940 22.94%
1941 30.14%
1942 12.46%
1943 10.40%
1944 12.44%
1945 11.58%
1946 12.92%
1947 9.30%
1948 15.58%
1949 15.98%
1950 24.44%
1951 24.72%
1952 13.08%
1953 22.94%
1954 29.82%
1955 19.02%
1956 18.70%
1957 16.44%
1958 21.42%
1959 12.86%
1960 13.16%
1961 13.36%
1962 7.72%
1963 17.72%
1964 17.54%
1965 15.16%
1966 16.40%
1967 8.20%
1968 16.24%
1969 11.80%
1970 8.34%
1971 10.10%
1972 14.92%
1973 19.52%
1974 10.58%
1975 17.70%
1976 23.42%
1977 9.40%
1978 19.70%
1979 24.30%
1980 10.28%
1981 21.20%
1982 20.06%
1983 27.14%
1984 15.34%
1985 17.58%
1986 18.28%
1987 21.26%
1988 17.38%
1989 19.36%
1990 24.30%
1991 19.40%
1992 18.90%
1993 22.32%
1994 12.60%
1995 16.80%
1996 31.48%
1997 14.68%
1998 41.54%
1999 27.14%
2000 16.96%
2001 22.40%
2002 20.38%
2003 25.14%
2004 18.86%
2005 21.86%
2006 34.40%
2007 31.98%
2008 18.42%
2009 15.86%
2010 24.34%
2011 28.34%
2012 52.04%
2013 19.90%
2014 28.26%
2015 42.98%

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.