Sea ice extent provided by the National Snow and Ice Data Center (NSIDC) is available from 1979–2025 for the Globe, Northern Hemisphere, and Southern Hemisphere. Snow cover extent provided by the Rutgers University Global Snow Laboratory (GSL) is available from 1967–2025 for the North America + Greenland, Northern Hemisphere, Eurasia, and North America. All anomalies are relative to the 1991–2020 average.




Northern Hemisphere Sea IceJanuary, 1979-202519792025198119831985198719891991199319951997199920012003200520072009201120132015201720192021202312.5015.5013.0013.5014.0014.5015.00Million km²4.835.985.025.215.415.605.79Million mi²1991-2020 Average: 13.98 million km²(5.40 million mi²)Source: National Snow and Ice Data Center (NSIDC)Decadal Trend: -2.86%-0.40 million km²ZingChart
Northern Hemisphere Sea Ice
January, 1979-2025
Year
Extent
million mi²
Anomaly
million mi²
Extent
million km²
Anomaly
million km²
Anomaly
% Difference
20255.07-0.3313.13-0.85-0.06
20245.37-0.0213.92-0.06-0.00
20235.15-0.2413.35-0.63-0.05
20225.36-0.0413.87-0.11-0.01
20215.21-0.1913.50-0.48-0.03
20205.27-0.1313.64-0.34-0.02
20195.24-0.1613.57-0.41-0.03
20185.05-0.3513.08-0.90-0.06
20175.09-0.3113.19-0.79-0.06
20165.20-0.2013.46-0.52-0.04
20155.25-0.1513.60-0.38-0.03
20145.27-0.1313.65-0.33-0.02
20135.29-0.1113.70-0.28-0.02
20125.30-0.1013.73-0.25-0.02
20115.20-0.2013.46-0.52-0.04
20105.31-0.0913.74-0.24-0.02
20095.37-0.0313.91-0.07-0.01
20085.36-0.0313.89-0.09-0.01
20075.29-0.1113.70-0.28-0.02
20065.20-0.2013.47-0.51-0.04
20055.27-0.1213.66-0.32-0.02
20045.420.0214.030.050.00
20035.560.1614.390.410.03
20025.510.1114.270.290.02
20015.480.0814.200.220.02
20005.490.0914.220.240.02
19995.540.1514.360.380.03
19985.680.2914.720.740.05
19975.570.1714.420.440.03
19965.470.0814.180.200.01
19955.630.2414.590.610.04
19945.690.2914.730.750.05
19935.750.3614.900.920.07
19925.650.2514.640.660.05
19915.540.1514.360.380.03
19905.710.3114.780.800.06
19895.770.3714.950.970.07
1988----------
19875.780.3814.970.990.07
19865.750.3514.890.910.07
19855.680.2914.720.740.05
19845.590.1914.470.490.04
19835.770.3714.940.960.07
19825.860.4615.181.200.09
19815.760.3614.910.930.07
19805.740.3414.860.880.06
19795.950.5515.411.430.10