"Figure 1. Ice Breakup Dates for Three Alaskan Rivers, 1896-2024",,,
Source: EPA's Climate Change Indicators in the United States: www.epa.gov/climate-indicators,,,
"Data source: National Snow and Ice Data Center, 2024; Yukon River Breakup, 2024; Kuskokwim Ice Classic, 2024; National Weather Service, 2024.",,,
Web update: December 2024,,,
Units: Days from January 1,,,
,,,
Year,Yukon River,Tanana River,Kuskokwim River
1896,134,,
1897,134,,
1898,133.6666667,,
1899,133.5555556,,
1900,132.8888889,,
1901,131.7777778,,
1902,131.1111111,,
1903,130.7777778,,
1904,129.7777778,,
1905,130.1111111,,
1906,129.7777778,,
1907,129.3333333,,
1908,129,,
1909,129.6666667,,
1910,129.6666667,,
1911,128.7777778,,
1912,128.6666667,,
1913,129.4444444,,
1914,129.4444444,,
1915,129.4444444,,
1916,130.7777778,,
1917,131,127.4,
1918,131,127.9111111,
1919,131,128.0888889,
1920,131.6666667,128.6,
1921,132.2222222,128.5555556,
1922,130.8888889,128.1111111,
1923,131.1111111,128.3333333,
1924,131,128.7777778,131.4
1925,129.6666667,128,131.6888889
1926,129.4444444,127.6666667,132.3111111
1927,129.1111111,127.4444444,132.7111111
1928,128.3333333,126.6666667,132.8888889
1929,128.3333333,126.2222222,131.5
1930,127.5555556,125.4444444,129.125
1931,129,127.5555556,131.375
1932,128.2222222,126.2222222,133.25
1933,128.2222222,126.7777778,134.25
1934,128.7777778,126.8888889,132.875
1935,129,125.8888889,132.2857143
1936,127.6666667,123.7777778,129.4285714
1937,127.3333333,123.8888889,128.4285714
1938,127,123,128.875
1939,127,122.7777778,130.375
1940,125.8888889,121.6666667,130.25
1941,127,123.3333333,130.875
1942,126.8888889,122.5555556,131.5
1943,126.5555556,122.2222222,133.25
1944,126.6666667,123.8888889,133.8888889
1945,128.2222222,126.4444444,137.2222222
1946,129.3333333,126.7777778,138.5555556
1947,129.5555556,126.7777778,138
1948,130.7777778,128.4444444,139.4444444
1949,130.6666667,127.7777778,138.6666667
1950,130.2222222,126.6666667,137
1951,130.6666667,127.1111111,136.3333333
1952,130.5555556,127,136.1111111
1953,130.1111111,126,134.7777778
1954,129.1111111,124.3333333,133.2222222
1955,129.6666667,124.5555556,133.5555556
1956,129.3333333,124.8888889,134.8888889
1957,128.8888889,124,131.7777778
1958,130.1111111,125.4444444,134.2222222
1959,129.3333333,125.3333333,134.7777778
1960,131.1111111,126.6666667,136.5555556
1961,132.2222222,127.2222222,136.75
1962,132.4444444,127.5555556,139.875
1963,133.3333333,128.1111111,139.25
1964,132.7777778,128.2222222,138.5
1965,132.7777778,127.6666667,136.875
1966,133,127.5555556,138.25
1967,132.5555556,127.1111111,137.75
1968,133.3333333,127.7777778,139.25
1969,131,125.8888889,136.625
1970,130.1111111,125.7777778,135.5555556
1971,129.8888889,126,134
1972,129.2222222,125.8888889,135.4444444
1973,128.8888889,125.5555556,136.3333333
1974,129,125.7777778,136.6666667
1975,128,125.3333333,135.7777778
1976,127.4444444,124.4444444,134.1111111
1977,127,123.2222222,132.3333333
1978,127.5555556,123.8888889,132.7777778
1979,126.5555556,123.1111111,133.2222222
1980,126.5555556,123.1111111,132.7777778
1981,127.6666667,124,133.4444444
1982,128.2222222,124.2222222,132.4444444
1983,128.5555556,124.7777778,133.4444444
1984,128.5555556,124.5555556,134.3333333
1985,127.6666667,124.6666667,134.5555556
1986,126.7777778,124,134.3333333
1987,125.3333333,123,133.2222222
1988,126.2222222,124.7777778,134.7777778
1989,125.1111111,122.8888889,133.4444444
1990,123.4444444,121.5555556,131.4444444
1991,122.1111111,120.2222222,130.5555556
1992,122,120.3333333,129.6666667
1993,122.2222222,120.5555556,128.5555556
1994,122.7777778,119.3333333,128
1995,123.6666667,119.8888889,129.3333333
1996,124.3333333,120,129.6666667
1997,124.2222222,119.2222222,128.6666667
1998,125.6666667,120.7777778,130
1999,126.3333333,120.7777778,129.4444444
2000,126.8888889,120.6666667,129.1111111
2001,125.8888889,119.7777778,129
2002,126.6666667,120,131.3333333
2003,126.6666667,120.7777778,131
2004,126.3333333,121.6666667,130.5555556
2005,126,121.5555556,130.3333333
2006,125.1111111,120.5555556,130.4444444
2007,124.5555556,120.2222222,130.1111111
2008,124,119.6666667,131.6666667
2009,125.1111111,122.4444444,134.5555556
2010,125.4444444,122.1111111,133.7777778
2011,124.6666667,121.2222222,131.6666667
2012,123.5555556,120.8888889,130.3333333
2013,123.3333333,120.2222222,129.4444444
2014,123.8888889,120.2222222,128.6666667
2015,123.1111111,118.5555556,124.7777778
2016,122.7777778,117.8888889,124
2017,123.2222222,118.5555556,122.8888889
2018,122.3333333,116.5555556,120.2222222
2019,123.1111111,118,122.2222222
2020,122.5555556,118.4444444,122.7777778
2021,123.7777778,119.2444444,124.7555556
2022,124,119.2666667,125.0666667
2023,123.6666667,119.2888889,125.8222222
2024,125,121.2,128.8