Year,Value,Contiguous U.S. (Lower 48),SLP,Jun-Aug,(hPa)
1940,1014.783
1941,1014.723
1942,1015.248
1943,1014.414
1944,1014.042
1945,1014.845
1946,1016.35
1947,1014.399
1948,1013.433
1949,1013.94
1950,1014.502
1951,1013.789
1952,1014.14
1953,1014.641
1954,1013.889
1955,1014.029
1956,1014.473
1957,1013.95
1958,1013.367
1959,1013.418
1960,1013.506
1961,1015.081
1962,1014.412
1963,1013.527
1964,1013.852
1965,1014.655
1966,1014.675
1967,1015.354
1968,1015.213
1969,1012.737
1970,1014.185
1971,1014.373
1972,1014.407
1973,1013.884
1974,1013.632
1975,1013.902
1976,1014.404
1977,1014.158
1978,1014.173
1979,1014.61
1980,1013.798
1981,1013.93
1982,1014.543
1983,1014.741
1984,1014.556
1985,1014.632
1986,1014.663
1987,1014.492
1988,1014.712
1989,1014.779
1990,1014.827
1991,1015.011
1992,1014.133
1993,1013.737
1994,1013.935
1995,1013.118
1996,1014.725
1997,1013.911
1998,1014.051
1999,1014.206
2000,1014.432
2001,1014.429
2002,1014.496
2003,1014.174
2004,1014.55
2005,1013.269
2006,1014.404
2007,1013.349
2008,1012.892
2009,1013.394
2010,1012.966
2011,1012.033
2012,1013.1
2013,1014.38
2014,1013.908
2015,1013.603
2016,1014.265
2017,1014.048
2018,1014.311
2019,1013.83
2020,1013.394
2021,1014.149
2022,1014.082
2023,1013.171
2024,1014.198
2025,1014.813