Year,Value,Contiguous U.S. (Lower 48),Temp,Jun-Aug,(°F)
1940,71.825
1941,70.96
1942,71.217
1943,72.476
1944,71.711
1945,70.222
1946,71.314
1947,70.799
1948,72.005
1949,72.366
1950,70.257
1951,71.371
1952,73.228
1953,72.805
1954,72.688
1955,72.164
1956,72.32
1957,72.139
1958,71.907
1959,72.756
1960,72.429
1961,72.328
1962,71.31
1963,71.953
1964,71.665
1965,70.632
1966,71.979
1967,70.896
1968,71.082
1969,71.931
1970,72.684
1971,71.854
1972,71.191
1973,72.213
1974,71.689
1975,71.493
1976,71.022
1977,72.645
1978,72.15
1979,71.57
1980,73.244
1981,72.637
1982,71.174
1983,72.711
1984,72.203
1985,71.871
1986,72.378
1987,72.43
1988,73.908
1989,71.923
1990,72.684
1991,72.611
1992,70.124
1993,71.055
1994,73.246
1995,72.606
1996,72.477
1997,71.427
1998,72.851
1999,72.322
2000,72.9
2001,73.216
2002,73.817
2003,73.361
2004,71.118
2005,73.543
2006,74.513
2007,74.15
2008,73.013
2009,71.936
2010,74.078
2011,74.789
2012,75.013
2013,73.49
2014,72.331
2015,73.766
2016,74.647
2017,73.86
2018,74.636
2019,73.604
2020,74.857
2021,75.179
2022,75.11
2023,74.327
2024,74.542