Year,Value,Contiguous U.S. (Lower 48),Precip,Jan,(in.)
1940,4.551
1941,14.134
1942,1.059
1943,10.674
1944,17.228
1945,3.157
1946,22.703
1947,21.727
1948,5.321
1949,61.355
1950,43.793
1951,14.115
1952,22.794
1953,16.332
1954,19.937
1955,9.936
1956,14.028
1957,16.819
1958,14.248
1959,13.476
1960,18.034
1961,3.91
1962,10.039
1963,7.359
1964,12.037
1965,19.241
1966,9.434
1967,19.732
1968,9.149
1969,41.389
1970,15.475
1971,13.027
1972,11.588
1973,19.73
1974,24.066
1975,19.401
1976,6.433
1977,7.649
1978,35.36
1979,42.122
1980,39.84
1981,3.299
1982,36.987
1983,15.758
1984,4.125
1985,11.455
1986,3.863
1987,16.414
1988,9.465
1989,15.005
1990,16.44
1991,15.044
1992,16.643
1993,37.877
1994,13.93
1995,24.565
1996,33.124
1997,27.156
1998,28.704
1999,35.374
2000,4.804
2001,17.068
2002,2.821
2003,0.998
2004,8.803
2005,37.395
2006,12.221
2007,12.151
2008,14.2
2009,2.678
2010,24.765
2011,10.44
2012,3.738
2013,15.154
2014,1.694
2015,10.469
2016,7.248
2017,42.043
2018,2.572
2019,11.244
2020,21.587
2021,7.933
2022,2.254
2023,32.931
2024,37.466
2025,1.773