Sea Ice and Snow Cover Extent

Sea ice extent provided by the National Snow and Ice Data Center (NSIDC) is available from 1979–2018 for the Northern Hemisphere, Southern Hemisphere, and Globe. Snow cover extent provided by the Rutgers University Global Snow Laboratory (GSL) is available from 1967–2018 for the North America + Greenland, Northern Hemisphere, Eurasia, and North America. All anomalies are relative to the 1981–2010 average.

Beginning in November 2017, NCEI will use version 3 of the National Snow and Ice Data Center's (NSIDC) monthly sea ice extent index. All historical monthly sea ice extent values will be updated to version 3, but historical reports will not be updated. For additional information on the methodology changes and comparisons to version 2, please visit the National Snow and Ice Data Center.

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Source: National Snow and Ice Data Center (NSIDC)

Download: xml csv json
Date Extent
million km²
Extent
million mi²
Anomaly
million km²
Anomaly
million mi²
Anomaly
% Difference
1979 12.53 4.84 0.76 0.30 6.46
1980 12.20 4.71 0.43 0.17 3.65
1981 12.43 4.80 0.66 0.26 5.61
1982 12.48 4.82 0.71 0.28 6.03
1983 12.30 4.75 0.53 0.21 4.50
1984 12.15 4.69 0.38 0.15 3.23
1985 12.22 4.72 0.45 0.18 3.82
1986 11.98 4.63 0.21 0.09 1.78
1987 12.49 4.82 0.72 0.28 6.12
1988 11.94 4.61 0.17 0.07 1.44
1989 12.24 4.73 0.47 0.19 3.99
1990 11.64 4.49 -0.13 -0.05 -1.10
1991 12.11 4.68 0.34 0.14 2.89
1992 12.15 4.69 0.38 0.15 3.23
1993 11.87 4.58 0.10 0.04 0.85
1994 12.02 4.64 0.25 0.10 2.12
1995 11.44 4.42 -0.33 -0.12 -2.80
1996 12.08 4.66 0.31 0.12 2.63
1997 11.74 4.53 -0.03 -0.01 -0.25
1998 11.71 4.52 -0.06 -0.02 -0.51
1999 11.78 4.55 0.01 0.01 0.08
2000 11.67 4.51 -0.10 -0.03 -0.85
2001 11.46 4.42 -0.31 -0.12 -2.63
2002 11.58 4.47 -0.19 -0.07 -1.61
2003 11.60 4.48 -0.17 -0.06 -1.44
2004 11.45 4.42 -0.32 -0.12 -2.72
2005 11.16 4.31 -0.61 -0.23 -5.18
2006 10.92 4.22 -0.85 -0.32 -7.22
2007 11.22 4.33 -0.55 -0.21 -4.67
2008 11.21 4.33 -0.56 -0.21 -4.76
2009 11.32 4.37 -0.45 -0.17 -3.82
2010 10.59 4.09 -1.18 -0.45 -10.03
2011 10.75 4.15 -1.02 -0.39 -8.67
2012 10.67 4.12 -1.10 -0.42 -9.35
2013 11.36 4.39 -0.41 -0.15 -3.48
2014 11.03 4.26 -0.74 -0.28 -6.29
2015 10.88 4.20 -0.89 -0.34 -7.56
2016 10.35 4.00 -1.42 -0.54 -12.06
2017 10.72 4.14 -1.05 -0.40 -8.92
2018 10.71 4.14 -1.06 -0.40 -9.01