| Mauna Loa Atmospheric CO2 Concentrations (ppmv) 1958 To 2003 (From June 30, 2004 Update) | ||||||||||||||
| Year | Jan. | Feb. | March | April | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Annual | Ann.Fit |
| 1958 | -99.99 | -99.99 | 315.71 | 317.45 | 317.50 | -99.99 | 315.86 | 314.93 | 313.19 | -99.99 | 313.34 | 314.67 | -99.99 | -99.99 |
| Delta | n/a | n/a | 0.94 | 0.26 | 0.79 | n/a | 0.69 | -0.13 | 0.65 | n/a | 1.47 | 0.92 | n/a | n/a |
| 1959 | 315.58 | 316.47 | 316.65 | 317.71 | 318.29 | 318.16 | 316.55 | 314.80 | 313.84 | 313.34 | 314.81 | 315.59 | 315.98 | 316.00 |
| Delta | 0.85 | 0.50 | 0.93 | 1.32 | 1.74 | 1.43 | 1.63 | 1.11 | 0.32 | 0.49 | 0.19 | 0.60 | 0.93 | 0.91 |
| 1960 | 316.43 | 316.97 | 317.58 | 319.03 | 320.03 | 319.59 | 318.18 | 315.91 | 314.16 | 313.83 | 315.00 | 316.19 | 316.91 | 316.91 |
| Delta | 0.46 | 0.73 | 0.96 | 0.45 | 0.55 | 0.19 | 0.40 | 0.88 | 0.83 | 1.48 | 1.10 | 0.82 | 0.74 | 0.72 |
| 1961 | 316.89 | 317.70 | 318.54 | 319.48 | 320.58 | 319.78 | 318.58 | 316.79 | 314.99 | 315.31 | 316.10 | 317.01 | 317.65 | 317.63 |
| Delta | 1.05 | 0.86 | 1.15 | 1.10 | 0.43 | 0.83 | 1.03 | 0.61 | 1.27 | 0.11 | 0.59 | 0.68 | 0.80 | 0.83 |
| 1962 | 317.94 | 318.56 | 319.69 | 320.58 | 321.01 | 320.61 | 319.61 | 317.40 | 316.26 | 315.42 | 316.69 | 317.69 | 318.45 | 318.46 |
| Delta | 0.80 | 0.52 | 0.17 | 0.81 | 1.23 | 0.86 | 0.13 | 0.37 | -0.05 | 0.57 | 0.38 | 0.67 | 0.54 | 0.56 |
| 1963 | 318.74 | 319.08 | 319.86 | 321.39 | 322.24 | 321.47 | 319.74 | 317.77 | 316.21 | 315.99 | 317.07 | 318.36 | 318.99 | 319.02 |
| Delta | 0.83 | n/a | n/a | n/a | -0.01 | 0.42 | 0.70 | 0.93 | 0.49 | 0.88 | 0.61 | 0.35 | n/a | 0.50 |
| 1964 | 319.57 | -99.99 | -99.99 | -99.99 | 322.23 | 321.89 | 320.44 | 318.70 | 316.70 | 316.87 | 317.68 | 318.71 | -99.99 | 319.52 |
| Delta | -0.13 | n/a | n/a | n/a | -0.07 | -0.02 | 0.77 | 0.17 | 1.11 | 0.43 | 1.19 | 0.71 | n/a | 0.57 |
| 1965 | 319.44 | 320.44 | 320.89 | 322.13 | 322.16 | 321.87 | 321.21 | 318.87 | 317.81 | 317.30 | 318.87 | 319.42 | 320.03 | 320.09 |
| Delta | 1.18 | 1.15 | 1.50 | 1.57 | 1.91 | 1.88 | 1.19 | 1.50 | 0.83 | 0.80 | 0.92 | 1.61 | 1.34 | 1.25 |
| 1966 | 320.62 | 321.59 | 322.39 | 323.70 | 324.07 | 323.75 | 322.40 | 320.37 | 318.64 | 318.10 | 319.79 | 321.03 | 321.37 | 321.34 |
| Delta | 1.71 | 0.91 | 0.65 | 0.72 | 0.93 | 0.34 | 0.15 | 0.55 | 0.62 | 1.29 | 0.93 | 0.93 | 0.81 | 0.79 |
| 1967 | 322.33 | 322.50 | 323.04 | 324.42 | 325.00 | 324.09 | 322.55 | 320.92 | 319.26 | 319.39 | 320.72 | 321.96 | 322.18 | 322.13 |
| Delta | 0.24 | 0.65 | 0.85 | 0.60 | 0.57 | 1.27 | 1.59 | 1.19 | 1.07 | 0.86 | 0.60 | 0.94 | 0.87 | 0.98 |
| 1968 | 322.57 | 323.15 | 323.89 | 325.02 | 325.57 | 325.36 | 324.14 | 322.11 | 320.33 | 320.25 | 321.32 | 322.90 | 323.05 | 323.11 |
| Delta | 1.43 | 1.27 | 1.75 | 1.64 | 1.81 | 1.34 | 1.75 | 1.56 | 2.05 | 1.53 | 1.53 | 1.22 | 1.57 | 1.49 |
| 1969 | 324.00 | 324.42 | 325.64 | 326.66 | 327.38 | 326.70 | 325.89 | 323.67 | 322.38 | 321.78 | 322.85 | 324.12 | 324.62 | 324.60 |
| Delta | 1.06 | 1.56 | 1.29 | 1.47 | 0.69 | 0.96 | 0.46 | 1.02 | 0.72 | 1.29 | 1.16 | 1.01 | 1.06 | 1.05 |
| 1970 | 325.06 | 325.98 | 326.93 | 328.13 | 328.07 | 327.66 | 326.35 | 324.69 | 323.10 | 323.07 | 324.01 | 325.13 | 325.68 | 325.65 |
| Delta | 1.11 | 0.70 | 0.25 | -0.35 | 0.85 | 0.91 | 1.02 | 0.74 | 0.26 | 0.49 | 0.79 | 0.88 | 0.64 | 0.67 |
| 1971 | 326.17 | 326.68 | 327.18 | 327.78 | 328.92 | 328.57 | 327.37 | 325.43 | 323.36 | 323.56 | 324.80 | 326.01 | 326.32 | 326.32 |
| Delta | 0.60 | 0.95 | 0.57 | 1.94 | 1.15 | 0.52 | 0.68 | 0.89 | 1.48 | 1.64 | 1.70 | 1.54 | 1.14 | 1.20 |
| 1972 | 326.77 | 327.63 | 327.75 | 329.72 | 330.07 | 329.09 | 328.05 | 326.32 | 324.84 | 325.20 | 326.50 | 327.55 | 327.46 | 327.52 |
| Delta | 1.77 | 1.93 | 2.55 | 1.78 | 2.41 | 2.98 | 2.82 | 2.99 | 2.67 | 1.98 | 1.66 | 1.09 | 2.22 | 2.09 |
| 1973 | 328.54 | 329.56 | 330.30 | 331.50 | 332.48 | 332.07 | 330.87 | 329.31 | 327.51 | 327.18 | 328.16 | 328.64 | 329.68 | 329.61 |
| Delta | 0.81 | 1.15 | 1.18 | 1.15 | 0.61 | 0.18 | 0.31 | 0.09 | -0.07 | 0.19 | 0.30 | 0.94 | 0.57 | 0.68 |
| 1974 | 329.35 | 330.71 | 331.48 | 332.65 | 333.09 | 332.25 | 331.18 | 329.40 | 327.44 | 327.37 | 328.46 | 329.58 | 330.25 | 330.29 |
| Delta | 1.05 | 0.70 | 0.56 | 0.66 | 0.87 | 1.34 | 0.73 | 0.66 | 1.12 | 0.97 | 1.03 | 1.18 | 0.90 | 0.87 |
| 1975 | 330.40 | 331.41 | 332.04 | 333.31 | 333.96 | 333.59 | 331.91 | 330.06 | 328.56 | 328.34 | 329.49 | 330.76 | 331.15 | 331.16 |
| Delta | 1.34 | 1.15 | 1.46 | 1.27 | 0.91 | 0.75 | 1.14 | 0.88 | 0.74 | 0.60 | 0.82 | 0.92 | 1.00 | 1.02 |
| 1976 | 331.74 | 332.56 | 333.50 | 334.58 | 334.87 | 334.34 | 333.05 | 330.94 | 329.30 | 328.94 | 330.31 | 331.68 | 332.15 | 332.18 |
| Delta | 1.18 | 0.86 | 1.20 | 1.49 | 1.87 | 1.93 | 1.88 | 1.81 | 2.28 | 2.22 | 2.09 | 2.17 | 1.75 | 1.70 |
| 1977 | 332.92 | 333.42 | 334.70 | 336.07 | 336.74 | 336.27 | 334.93 | 332.75 | 331.58 | 331.16 | 332.40 | 333.85 | 333.90 | 333.88 |
| Delta | 2.05 | 1.97 | 1.94 | 1.69 | 1.27 | 1.62 | 1.61 | 1.93 | 1.18 | 1.38 | 1.52 | 1.10 | 1.60 | 1.64 |
| 1978 | 334.97 | 335.39 | 336.64 | 337.76 | 338.01 | 337.89 | 336.54 | 334.68 | 332.76 | 332.54 | 333.92 | 334.95 | 335.50 | 335.52 |
| Delta | 1.26 | 1.37 | 1.32 | 1.13 | 1.46 | 1.40 | 1.19 | 1.41 | 1.15 | 1.32 | 1.37 | 1.78 | 1.35 | 1.37 |
| 1979 | 336.23 | 336.76 | 337.96 | 338.89 | 339.47 | 339.29 | 337.73 | 336.09 | 333.91 | 333.86 | 335.29 | 336.73 | 336.85 | 336.89 |
| Delta | 1.78 | 1.60 | 2.12 | 1.88 | 1.99 | 1.88 | 1.83 | 1.51 | 1.97 | 2.15 | 1.81 | 1.48 | 1.84 | 1.78 |
| 1980 | 338.01 | 338.36 | 340.08 | 340.77 | 341.46 | 341.17 | 339.56 | 337.60 | 335.88 | 336.01 | 337.10 | 338.21 | 338.69 | 338.67 |
| Delta | 1.22 | 2.11 | 1.30 | 1.74 | 1.45 | 1.08 | 0.93 | 0.83 | 0.81 | 0.84 | 1.26 | 1.40 | 1.24 | 1.28 |
| 1981 | 339.23 | 340.47 | 341.38 | 342.51 | 342.91 | 342.25 | 340.49 | 338.43 | 336.69 | 336.85 | 338.36 | 339.61 | 339.93 | 339.95 |
| Delta | 1.52 | 1.14 | 1.32 | 1.05 | 1.22 | 1.10 | 1.57 | 1.39 | 1.28 | 1.01 | 0.90 | 0.88 | 1.20 | 1.14 |
| 1982 | 340.75 | 341.61 | 342.70 | 343.56 | 344.13 | 343.35 | 342.06 | 339.82 | 337.97 | 337.86 | 339.26 | 340.49 | 341.13 | 341.09 |
| Delta | 0.62 | 0.91 | 0.40 | 1.38 | 1.62 | 1.97 | 1.93 | 2.57 | 1.89 | 2.13 | 1.90 | 2.50 | 1.65 | 1.66 |
| 1983 | 341.37 | 342.52 | 343.10 | 344.94 | 345.75 | 345.32 | 343.99 | 342.39 | 339.86 | 339.99 | 341.16 | 342.99 | 342.78 | 342.75 |
| Delta | 2.33 | 1.99 | 2.18 | 2.14 | 1.68 | 1.47 | 1.41 | 0.89 | 1.21 | 1.36 | 1.82 | 1.23 | 1.64 | 1.69 |
| 1984 | 343.70 | 344.51 | 345.28 | 347.08 | 347.43 | 346.79 | 345.40 | 343.28 | 341.07 | 341.35 | 342.98 | 344.22 | 344.42 | 344.44 |
| Delta | 1.27 | 1.49 | 2.15 | 1.27 | 1.50 | 1.46 | 1.16 | 1.41 | 2.02 | 1.45 | 1.26 | 1.34 | 1.48 | 1.42 |
| 1985 | 344.97 | 346.00 | 347.43 | 348.35 | 348.93 | 348.25 | 346.56 | 344.69 | 343.09 | 342.80 | 344.24 | 345.56 | 345.90 | 345.86 |
| Delta | 1.32 | 0.96 | 0.43 | 1.20 | 1.28 | 1.29 | 1.38 | 1.22 | 1.77 | 1.37 | 1.42 | 1.34 | 1.25 | 1.28 |
| 1986 | 346.29 | 346.96 | 347.86 | 349.55 | 350.21 | 349.54 | 347.94 | 345.91 | 344.86 | 344.17 | 345.66 | 346.90 | 347.15 | 347.14 |
| Delta | 1.73 | 1.51 | 1.56 | 1.44 | 1.63 | 1.71 | 1.58 | 2.19 | 1.58 | 2.19 | 2.15 | 2.06 | 1.78 | 1.85 |
| 1987 | 348.02 | 348.47 | 349.42 | 350.99 | 351.84 | 351.25 | 349.52 | 348.10 | 346.44 | 346.36 | 347.81 | 348.96 | 348.93 | 348.99 |
| Delta | 2.41 | 3.25 | 2.80 | 2.60 | 2.38 | 2.54 | 2.87 | 2.34 | 2.28 | 2.52 | 2.26 | 2.38 | 2.55 | 2.45 |
| 1988 | 350.43 | 351.72 | 352.22 | 353.59 | 354.22 | 353.79 | 352.39 | 350.44 | 348.72 | 348.88 | 350.07 | 351.34 | 351.48 | 351.44 |
| Delta | 2.33 | 1.35 | 1.46 | 1.83 | 1.45 | 1.34 | 1.51 | 1.23 | 1.08 | 1.11 | 1.23 | 1.19 | 1.43 | 1.50 |
| 1989 | 352.76 | 353.07 | 353.68 | 355.42 | 355.67 | 355.13 | 353.90 | 351.67 | 349.80 | 349.99 | 351.30 | 352.53 | 352.91 | 352.94 |
| Delta | 0.90 | 1.63 | 1.71 | 0.78 | 1.49 | 1.09 | 0.92 | 1.24 | 1.16 | 1.19 | 1.53 | 1.68 | 1.28 | 1.25 |
| 1990 | 353.66 | 354.70 | 355.39 | 356.20 | 357.16 | 356.22 | 354.82 | 352.91 | 350.96 | 351.18 | 352.83 | 354.21 | 354.19 | 354.19 |
| Delta | 1.06 | 1.05 | 1.77 | 2.40 | 2.18 | 2.02 | 1.35 | 1.12 | 1.20 | 1.03 | 0.92 | 0.78 | 1.40 | 1.43 |
| 1991 | 354.72 | 355.75 | 357.16 | 358.60 | 359.34 | 358.24 | 356.17 | 354.03 | 352.16 | 352.21 | 353.75 | 354.99 | 355.59 | 355.62 |
| Delta | 1.26 | 0.97 | 0.65 | 0.55 | 0.32 | 1.01 | 0.86 | 0.97 | 0.85 | 1.10 | 0.41 | 0.41 | 0.78 | 0.74 |
| 1992 | 355.98 | 356.72 | 357.81 | 359.15 | 359.66 | 359.25 | 357.03 | 355.00 | 353.01 | 353.31 | 354.16 | 355.40 | 356.37 | 356.36 |
| Delta | 0.72 | 0.44 | 0.57 | 0.31 | 0.62 | 0.35 | 0.54 | 0.52 | 0.69 | 0.67 | 1.17 | 1.40 | 0.67 | 0.74 |
| 1993 | 356.70 | 357.16 | 358.38 | 359.46 | 360.28 | 359.60 | 357.57 | 355.52 | 353.70 | 353.98 | 355.33 | 356.80 | 357.04 | 357.10 |
| Delta | 1.66 | 1.75 | 1.59 | 1.80 | 1.40 | 1.35 | 1.98 | 1.97 | 2.14 | 2.01 | 2.25 | 2.24 | 1.84 | 1.76 |
| 1994 | 358.36 | 358.91 | 359.97 | 361.26 | 361.68 | 360.95 | 359.55 | 357.49 | 355.84 | 355.99 | 357.58 | 359.04 | 358.88 | 358.86 |
| Delta | 1.60 | 2.09 | 1.67 | 2.19 | 2.11 | 2.31 | 2.35 | 1.97 | 2.22 | 1.76 | 1.98 | 1.66 | 2.00 | 2.04 |
| 1995 | 359.96 | 361.00 | 361.64 | 363.45 | 363.79 | 363.26 | 361.90 | 359.46 | 358.06 | 357.75 | 359.56 | 360.70 | 360.88 | 360.90 |
| Delta | 2.09 | 2.25 | 2.39 | 1.27 | 1.62 | 1.71 | 1.75 | 2.03 | 1.40 | 1.85 | 1.20 | 1.63 | 1.76 | 1.68 |
| 1996 | 362.05 | 363.25 | 364.03 | 364.72 | 365.41 | 364.97 | 363.65 | 361.49 | 359.46 | 359.60 | 360.76 | 362.33 | 362.64 | 362.58 |
| Delta | 1.13 | 0.75 | 0.54 | 1.63 | 1.38 | 0.65 | 0.82 | 1.02 | 0.73 | 1.17 | 1.67 | 1.95 | 1.12 | 1.26 |
| 1997 | 363.18 | 364.00 | 364.57 | 366.35 | 366.79 | 365.62 | 364.47 | 362.51 | 360.19 | 360.77 | 362.43 | 364.28 | 363.76 | 363.84 |
| Delta | 2.14 | 2.15 | 2.74 | 2.26 | 2.50 | 3.25 | 3.17 | 3.26 | 3.71 | 3.46 | 3.03 | 2.69 | 2.87 | 2.74 |
| 1998 | 365.32 | 366.15 | 367.31 | 368.61 | 369.29 | 368.87 | 367.64 | 365.77 | 363.90 | 364.23 | 365.46 | 366.97 | 366.63 | 366.58 |
| Delta | 2.83 | 2.72 | 2.28 | 2.53 | 1.71 | 1.48 | 1.63 | 1.17 | 0.73 | 0.89 | 1.21 | 1.04 | 1.68 | 1.72 |
| 1999 | 368.15 | 368.87 | 369.59 | 371.14 | 371.00 | 370.35 | 369.27 | 366.94 | 364.63 | 365.12 | 366.67 | 368.01 | 368.31 | 368.30 |
| Delta | 0.99 | 0.59 | 0.93 | 0.52 | 0.82 | 1.35 | 0.85 | 1.18 | 1.99 | 1.61 | 1.62 | 1.52 | 1.17 | 1.17 |
| 2000 | 369.14 | 369.46 | 370.52 | 371.66 | 371.82 | 371.70 | 370.12 | 368.12 | 366.62 | 366.73 | 368.29 | 369.53 | 369.48 | 369.47 |
| Delta | 1.14 | 2.04 | 1.60 | 1.21 | 2.20 | 1.60 | 1.50 | 1.43 | 1.34 | 1.36 | 1.39 | 1.71 | 1.54 | 1.56 |
| 2001 | 370.28 | 371.50 | 372.12 | 372.87 | 374.02 | 373.30 | 371.62 | 369.55 | 367.96 | 368.09 | 369.68 | 371.24 | 371.02 | 371.03 |
| Delta | 2.15 | 1.59 | 1.40 | 1.99 | 1.53 | 2.11 | 2.40 | 1.94 | 2.75 | 2.16 | 2.40 | 2.54 | 2.08 | 2.04 |
| 2002 | 372.43 | 373.09 | 373.52 | 374.86 | 375.55 | 375.41 | 374.02 | 371.49 | 370.71 | 370.25 | 372.08 | 373.78 | 373.10 | 373.07 |
| Delta | 2.25 | 2.54 | 2.59 | 2.79 | 2.80 | 2.72 | 2.60 | 3.01 | 2.28 | 2.75 | 2.27 | 1.92 | 2.54 | 2.54 |
| 2003 | 374.68 | 375.63 | 376.11 | 377.65 | 378.35 | 378.13 | 376.62 | 374.50 | 372.99 | 373.00 | 374.35 | 375.70 | 375.64 | 375.61 |
| Source: | http://cdiac.esd.ornl.gov/ftp/maunaloa-co2/maunaloa.co2 | |||||||||||||
| ftp://cdiac.esd.ornl.gov/pub/maunaloa-co2/maunaloa.co2 | ||||||||||||||