| Year | All greenhouse gases including aerosols | 67 % probability of below 1.5 °C | 67 % probability of below 2 °C |
|---|---|---|---|
| 1750 | 278 | 465 | 505 |
| 1755 | 278.206433 | 465 | 505 |
| 1760 | 278.447498 | 465 | 505 |
| 1765 | 278.7215589 | 465 | 505 |
| 1770 | 279.0229466 | 465 | 505 |
| 1775 | 279.3503946 | 465 | 505 |
| 1780 | 279.7492275 | 465 | 505 |
| 1785 | 280.2161934 | 465 | 505 |
| 1790 | 280.754692 | 465 | 505 |
| 1795 | 281.3615868 | 465 | 505 |
| 1800 | 281.9890803 | 465 | 505 |
| 1805 | 282.6363376 | 465 | 505 |
| 1810 | 283.3808083 | 465 | 505 |
| 1815 | 284.2184507 | 465 | 505 |
| 1820 | 285.1392642 | 465 | 505 |
| 1825 | 286.1399909 | 465 | 505 |
| 1830 | 287.2070966 | 465 | 505 |
| 1835 | 288.3381409 | 465 | 505 |
| 1840 | 289.5446955 | 465 | 505 |
| 1845 | 290.8241009 | 465 | 505 |
| 1850 | 282.1579163 | 465 | 505 |
| 1855 | 283.0676268 | 465 | 505 |
| 1860 | 283.9802704 | 465 | 505 |
| 1865 | 284.8116367 | 465 | 505 |
| 1870 | 285.6454369 | 465 | 505 |
| 1875 | 287.4361749 | 465 | 505 |
| 1880 | 289.2381391 | 465 | 505 |
| 1885 | 291.1850725 | 465 | 505 |
| 1890 | 293.1451111 | 465 | 505 |
| 1895 | 294.1809408 | 465 | 505 |
| 1900 | 295.2204305 | 465 | 505 |
| 1905 | 297.9042869 | 465 | 505 |
| 1910 | 300.6125423 | 465 | 505 |
| 1915 | 303.2127117 | 465 | 505 |
| 1920 | 305.8353714 | 465 | 505 |
| 1925 | 308.2554137 | 465 | 505 |
| 1930 | 310.6946056 | 465 | 505 |
| 1935 | 313.4530309 | 465 | 505 |
| 1940 | 316.2359461 | 465 | 505 |
| 1945 | 317.2171803 | 465 | 505 |
| 1950 | 318.2014591 | 465 | 505 |
| 1955 | 319.2889528 | 465 | 505 |
| 1960 | 322.5355027 | 465 | 505 |
| 1965 | 324.7896639 | 465 | 505 |
| 1970 | 329.9932639 | 465 | 505 |
| 1975 | 343.0387691 | 465 | 505 |
| 1978 | 351.7101606 | 465 | 505 |
| 1979 | 354.5766893 | 465 | 505 |
| 1980 | 358.6201776 | 465 | 505 |
| 1981 | 360.8224467 | 465 | 505 |
| 1982 | 363.0668343 | 465 | 505 |
| 1983 | 365.3953662 | 465 | 505 |
| 1984 | 367.8706243 | 465 | 505 |
| 1985 | 370.3252681 | 465 | 505 |
| 1986 | 372.8997487 | 465 | 505 |
| 1987 | 375.7201702 | 465 | 505 |
| 1988 | 379.9831371 | 465 | 505 |
| 1989 | 382.6367764 | 465 | 505 |
| 1990 | 384.5142353 | 465 | 505 |
| 1991 | 386.731261 | 465 | 505 |
| 1992 | 387.4409474 | 465 | 505 |
| 1993 | 387.9898406 | 465 | 505 |
| 1994 | 389.5954159 | 465 | 505 |
| 1995 | 391.6974684 | 465 | 505 |
| 1996 | 393.6363947 | 465 | 505 |
| 1997 | 394.7531212 | 465 | 505 |
| 1998 | 397.4361148 | 465 | 505 |
| 1999 | 399.775511 | 465 | 505 |
| 2000 | 400.8203176 | 465 | 505 |
| 2001 | 403.423857 | 465 | 505 |
| 2002 | 406.7253888 | 465 | 505 |
| 2003 | 410.7266062 | 465 | 505 |
| 2004 | 413.4531551 | 465 | 505 |
| 2005 | 417.0654082 | 465 | 505 |
| 2006 | 419.872622 | 465 | 505 |
| 2007 | 423.4312941 | 465 | 505 |
| 2008 | 426.4673747 | 465 | 505 |
| 2009 | 427.9646763 | 465 | 505 |
| 2010 | 430.9538053 | 465 | 505 |
| 2011 | 435.0043336 | 465 | 505 |
| 2012 | 439.8957476 | 465 | 505 |
| 2013 | 442.2267457 | 465 | 505 |
| 2014 | 443.7238566 | 465 | 505 |
| 2015 | 445.3724615 | 465 | 505 |
| 2016 | 449.7503411 | 465 | 505 |
| 2017 | 453.1760057 | 465 | 505 |
| 2018 | 456.8077459 | 465 | 505 |