Year,Value,Contiguous U.S. (Lower 48),Temp,Jan-Jun,(°F)
1940,44.165
1941,45.172
1942,44.636
1943,46.268
1944,46.453
1945,46.206
1946,47.545
1947,44.577
1948,46.484
1949,47.011
1950,46.888
1951,46.882
1952,48.276
1953,49.109
1954,48.888
1955,47.02
1956,47.751
1957,47.683
1958,47.252
1959,47.847
1960,46.436
1961,48.054
1962,47.065
1963,47.416
1964,47.351
1965,46.608
1966,46.623
1967,47.751
1968,47.331
1969,46.768
1970,47.016
1971,47.061
1972,48.123
1973,47.678
1974,48.789
1975,46.726
1976,48.716
1977,48.514
1978,46.203
1979,45.313
1980,47.76
1981,49.685
1982,46.481
1983,47.734
1984,47.839
1985,47.861
1986,50.454
1987,49.916
1988,48.402
1989,48.269
1990,50.304
1991,49.676
1992,50.14
1993,47.226
1994,48.821
1995,48.524
1996,47.801
1997,47.699
1998,49.328
1999,49.339
2000,50.782
2001,48.611
2002,49.159
2003,48.396
2004,49.18
2005,49.433
2006,51.312
2007,49.563
2008,48.309
2009,49.071
2010,48.711
2011,48.298
2012,52.861
2013,48.741
2014,48.14
2015,50.049
2016,51.385
2017,51.618
2018,50.215
2019,48.316
2020,50.807
2021,50.034
2022,49.488
2023,49.888
2024,51.35
2025,50.256