{
  "source": "NSIDC Sea Ice Index, Version 4 (G02135), Northern Hemisphere, files snapshotted in this folder",
  "first_year": 1979,
  "last_year": 2026,
  "years": 48,
  "latest_day": "2026-11-06",
  "amsr2_from": "2025-01-01",
  "amsr2_offset_mkm2": 0.1,
  "tie_threshold_mkm2": 0.04,
  "minimum": {
    "y2026": {
      "extent": 4.598,
      "date": "2026-09-12",
      "rank_lowest": 11,
      "tied_within_0_04_with": [
        2008,
        2010,
        2025
      ],
      "tied_rank": 10,
      "rank_if_amsr2_years_0_1_higher": 14
    },
    "trend_by_start_year_to_2026": {
      "2002": -0.49,
      "2003": -0.46,
      "2004": -0.36,
      "2005": -0.26,
      "2006": -0.2,
      "2007": -0.03,
      "2008": -0.09,
      "2009": -0.09,
      "2010": 0.03,
      "2011": 0.08,
      "2012": 0.08,
      "2013": -0.25
    },
    "y2025": {
      "extent": 4.602,
      "date": "2025-09-10",
      "rank_lowest": 12
    },
    "neighbours_of_2026": [
      {
        "year": 2015,
        "extent": 4.433,
        "rank": 9
      },
      {
        "year": 2008,
        "extent": 4.586,
        "rank": 10
      },
      {
        "year": 2026,
        "extent": 4.598,
        "rank": 11
      },
      {
        "year": 2025,
        "extent": 4.602,
        "rank": 12
      },
      {
        "year": 2010,
        "extent": 4.615,
        "rank": 13
      }
    ],
    "record": {
      "year": 2012,
      "extent": 3.387,
      "date": "2012-09-17"
    },
    "lowest_20_years": [
      2007,
      2008,
      2009,
      2010,
      2011,
      2012,
      2013,
      2014,
      2015,
      2016,
      2017,
      2018,
      2019,
      2020,
      2021,
      2022,
      2023,
      2024,
      2025,
      2026
    ],
    "lowest_20_all_since_break": true,
    "since_break_years": 20,
    "lowest_before_break": {
      "year": 2005,
      "extent": 5.319
    },
    "highest_since_break": {
      "year": 2009,
      "extent": 5.12
    },
    "every_year_since_below_every_year_before": true,
    "mean_1979_1988": 7,
    "mean_2007_2016": 4.49,
    "mean_2017_2026": 4.45,
    "trend_1979_2006": {
      "from": 1979,
      "to": 2006,
      "years": 28,
      "per_decade": -0.54,
      "ci95_low": -0.74,
      "ci95_high": -0.35,
      "significant_95": true,
      "fit_from": 7.257,
      "fit_to": 5.788
    },
    "trend_2007_2026": {
      "from": 2007,
      "to": 2026,
      "years": 20,
      "per_decade": -0.03,
      "ci95_low": -0.38,
      "ci95_high": 0.32,
      "significant_95": false,
      "fit_from": 4.5,
      "fit_to": 4.44
    },
    "trend_1979_2026": {
      "from": 1979,
      "to": 2026,
      "years": 48,
      "per_decade": -0.73,
      "ci95_low": -0.84,
      "ci95_high": -0.62,
      "significant_95": true,
      "fit_from": 7.393,
      "fit_to": 3.942
    },
    "trend_2002_2026": {
      "from": 2002,
      "to": 2026,
      "years": 25,
      "per_decade": -0.49,
      "ci95_low": -0.8,
      "ci95_high": -0.19,
      "significant_95": true,
      "fit_from": 5.311,
      "fit_to": 4.124
    },
    "trend_2005_2026": {
      "from": 2005,
      "to": 2026,
      "years": 22,
      "per_decade": -0.26,
      "ci95_low": -0.61,
      "ci95_high": 0.08,
      "significant_95": false,
      "fit_from": 4.846,
      "fit_to": 4.29
    },
    "trend_2010_2026": {
      "from": 2010,
      "to": 2026,
      "years": 17,
      "per_decade": 0.03,
      "ci95_low": -0.42,
      "ci95_high": 0.49,
      "significant_95": false,
      "fit_from": 4.416,
      "fit_to": 4.472
    },
    "trend_2012_2026": {
      "from": 2012,
      "to": 2026,
      "years": 15,
      "per_decade": 0.08,
      "ci95_low": -0.52,
      "ci95_high": 0.67,
      "significant_95": false,
      "fit_from": 4.385,
      "fit_to": 4.493
    },
    "trend_2013_2026": {
      "from": 2013,
      "to": 2026,
      "years": 14,
      "per_decade": -0.25,
      "ci95_low": -0.75,
      "ci95_high": 0.25,
      "significant_95": false,
      "fit_from": 4.678,
      "fit_to": 4.351
    }
  },
  "maximum": {
    "y2026": {
      "extent": 14.286,
      "date": "2026-03-15",
      "rank_lowest": 1,
      "tied_within_0_04_with": [
        2025
      ],
      "tied_rank": 1,
      "gap_to_2025": 0.021
    },
    "y2025": {
      "extent": 14.307,
      "date": "2025-03-22",
      "rank_lowest": 2
    },
    "lowest_before_amsr2": {
      "year": 2017,
      "extent": 14.406,
      "gap_to_2026": 0.12,
      "gap_to_2025": 0.099
    },
    "lowest_before_break": {
      "year": 2006,
      "extent": 14.683
    },
    "lowest_10_years": [
      2026,
      2025,
      2017,
      2018,
      2016,
      2015,
      2023,
      2011,
      2006,
      2007
    ],
    "record_high": {
      "year": 1979,
      "extent": 16.588
    },
    "mean_1979_1988": 16.18,
    "mean_2007_2016": 14.96,
    "mean_2017_2026": 14.66,
    "mean_2017_2024_before_amsr2": 14.75,
    "trend_1979_2006": {
      "from": 1979,
      "to": 2006,
      "years": 28,
      "per_decade": -0.44,
      "ci95_low": -0.56,
      "ci95_high": -0.31,
      "significant_95": true,
      "fit_from": 16.362,
      "fit_to": 15.186
    },
    "trend_2007_2026": {
      "from": 2007,
      "to": 2026,
      "years": 20,
      "per_decade": -0.31,
      "ci95_low": -0.54,
      "ci95_high": -0.08,
      "significant_95": true,
      "fit_from": 15.101,
      "fit_to": 14.514
    },
    "trend_1979_2026": {
      "from": 1979,
      "to": 2026,
      "years": 48,
      "per_decade": -0.4,
      "ci95_low": -0.46,
      "ci95_high": -0.35,
      "significant_95": true,
      "fit_from": 16.317,
      "fit_to": 14.426
    },
    "trend_2007_2024_before_amsr2": {
      "from": 2007,
      "to": 2024,
      "years": 18,
      "per_decade": -0.21,
      "ci95_low": -0.49,
      "ci95_high": 0.06,
      "significant_95": false,
      "fit_from": 15.045,
      "fit_to": 14.683
    },
    "months": {
      "02": 7,
      "03": 40,
      "04": 1
    }
  },
  "season_2026": {
    "days": 310,
    "days_below_1981_2010_p10": 306,
    "days_not_below_p10": [
      "2026-10-03",
      "2026-10-06",
      "2026-10-07",
      "2026-10-08"
    ],
    "days_below_1981_2010_median": 310,
    "minimum_day_extent": 4.574,
    "minimum_day_median_1981_2010": 6.404,
    "minimum_day_gap_to_median": 1.83
  },
  "cross_checks": {
    "nsidc_table_years": "1979-2025",
    "max_abs_diff_vs_nsidc_1988_2025": 0.001,
    "max_abs_diff_vs_nsidc_1979_1987": 0.055,
    "nsidc_min_trend_1979_2006": -0.54,
    "nsidc_min_trend_2007_2025": -0.06,
    "our_min_trend_2007_2025": -0.06,
    "lowest_20_minima_to_2025_match_nsidc": true,
    "nsidc_2025_min_rank_of_47": 11,
    "september_mean_2026": 4.81,
    "september_mean_2026_rank_lowest": 13,
    "september_mean_trend_1979_2006": -0.55,
    "september_mean_trend_2007_2026": -0.03,
    "march_mean_2026": 14.13,
    "march_mean_2026_rank_lowest": 2,
    "march_mean_2025_rank_lowest": 1,
    "march_mean_trend_1979_2006": -0.42,
    "march_mean_trend_2007_2026": -0.33
  }
}