月 日 平年値 最大値 海氷年度 最小値 海氷年度 11 5 0.63 1.46 2002 0.00 2021 11 10 1.13 2.16 2014 0.28 2013 11 15 1.79 3.45 2001 0.36 2013 11 20 2.74 6.83 2001 1.19 2006 11 25 4.75 16.32 2001 1.76 2013 11 30 8.26 22.14 1999 2.21 2014 12 5 13.54 40.94 1999 3.32 1996 12 10 18.96 45.21 1999 4.60 2013 12 15 25.05 53.62 1999 5.08 2014 12 20 31.52 55.55 2001 7.87 2014 12 25 37.68 82.70 1979 12.94 2014 12 31 43.59 99.98 1979 14.64 2009 1 5 49.54 104.52 1979 24.73 1996 1 10 56.40 103.92 1979 21.45 1996 1 15 63.41 122.55 1979 35.82 1996 1 20 72.14 131.27 1979 47.60 2006 1 25 76.90 138.26 1979 46.35 1996 1 31 80.45 132.53 1979 50.69 2006 2 5 86.04 135.44 1979 50.75 1996 2 10 91.23 132.87 2001 56.37 2015 2 15 96.03 142.56 2001 52.97 2015 2 20 100.24 148.00 2001 57.45 2015 2 25 102.90 148.56 1978 64.73 2015 2 28 105.05 152.25 1978 70.26 2015 3 5 105.63 151.67 2001 65.96 2015 3 10 103.85 150.18 2001 60.36 2015 3 15 102.56 151.65 2001 57.79 2015 3 20 98.16 146.63 2001 56.01 2017 3 25 95.22 134.24 1979 51.18 2015 3 31 91.67 131.53 1980 52.35 2009 4 5 85.12 139.81 1980 43.32 1974 4 10 76.18 125.26 1980 44.92 1974 4 15 67.20 125.81 1980 37.40 2017 4 20 58.10 125.79 1980 30.99 2017 4 25 49.86 109.38 1980 24.46 2017 4 30 40.68 96.50 1980 17.53 1997 5 5 33.05 84.98 1980 15.87 1997 5 10 26.40 76.78 1980 12.72 2019 5 15 21.48 66.34 1980 9.44 2014 5 20 17.00 50.34 1980 8.08 2014 5 25 13.33 37.11 2001 2.32 1976 5 31 10.05 27.22 2001 0.62 1976 6 5 8.22 20.12 2001 2.96 2019 6 10 5.95 17.48 1999 2.04 2017 6 15 4.29 13.01 2001 0.76 2018 6 20 2.88 8.04 2001 0.11 2018 6 25 2.15 6.58 2001 0.01 2018 6 30 1.58 5.07 2013 0.00 2018 7 5 1.09 4.10 2001 0.00 2018 7 10 0.75 3.75 2001 0.00 2023 7 15 0.40 2.83 2001 0.00 2023 7 20 0.22 2.06 2001 0.00 2023 7 25 0.13 1.82 2001 0.00 2023 7 31 0.07 1.13 2001 0.00 2023 最大 111.75 152.25 1978 70.26 2015 積算 2246.23 3498.43 1979 1576.80 2015