Year,Value,Contiguous U.S. (Lower 48),Snow,Sep,(in.)
1940,0.035
1941,0.625
1942,0.255
1943,0.007
1944,0.138
1945,0.658
1946,0.201
1947,0.305
1948,0.292
1949,0.078
1950,0.522
1951,0.223
1952,0.052
1953,0.049
1954,0.208
1955,0.261
1956,0.032
1957,0.297
1958,0.19
1959,0.749
1960,0.035
1961,0.895
1962,0.156
1963,0.013
1964,0.164
1965,1.587
1966,0.102
1967,0.084
1968,0.42
1969,0.01
1970,0.583
1971,0.987
1972,0.454
1973,0.367
1974,0.22
1975,0.029
1976,0.051
1977,0.183
1978,0.613
1979,0.016
1980,0.071
1981,0.1
1982,1.042
1983,0.499
1984,1.124
1985,1.052
1986,0.659
1987,0.02
1988,0.38
1989,0.208
1990,0.014
1991,0.066
1992,0.075
1993,0.194
1994,0.018
1995,0.326
1996,0.375
1997,0.03
1998,0.022
1999,0.171
2000,0.578
2001,0.105
2002,0.083
2003,0.154
2004,0.243
2005,0.137
2006,0.407
2007,0.225
2008,0.077
2009,0.167
2010,0.044
2011,0.005
2012,0.004
2013,0.406
2014,0.176
2015,0.023
2016,0.131
2017,0.573
2018,0.073
2019,0.563
2020,0.495
2021,0.038
2022,0.01
2023,0.048
2024,0.027
2025,0.01