Year,Value,Upper Yukon Valley( Fire PSA),Temp,May,(°F) 1940,42.5 1941,38.782 1942,39.292 1943,41.414 1944,40.657 1945,35.08 1946,41.011 1947,40.783 1948,35.607 1949,33.459 1950,39.683 1951,39.643 1952,31.525 1953,39.75 1954,39.323 1955,36.992 1956,39.053 1957,37.882 1958,39.649 1959,36.331 1960,41.195 1961,40.914 1962,34.436 1963,40.89 1964,29.557 1965,33.297 1966,35.656 1967,36.06 1968,35.675 1969,39.594 1970,38.416 1971,38.316 1972,37.663 1973,40.657 1974,38.766 1975,39.762 1976,38.762 1977,39.073 1978,36.516 1979,42.638 1980,39.755 1981,44.193 1982,34.485 1983,34.183 1984,38.247 1985,36.664 1986,34.493 1987,39.217 1988,39.579 1989,39.543 1990,45.03 1991,45.748 1992,31.78 1993,40.983 1994,42.917 1995,45.756 1996,39.581 1997,39.757 1998,42.926 1999,39.422 2000,34.568 2001,33.437 2002,38.904 2003,37.629 2004,41.648 2005,47.655 2006,41.826 2007,41.056 2008,40.584 2009,42.561 2010,45.649 2011,43.794 2012,39.648 2013,34.372 2014,42.691 2015,49.263 2016,45.462 2017,43.861 2018,41.033 2019,45.038 2020,44.007 2021,40.527 2022,40.507 2023,43.897 2024,39.708 2025,37.893