# IPCC, 2013: Climate Change 2013 -- Physical Science Basis. # Annex II. Climate System Scenario Tables. # Table AII.1.3 # Historical decadal mean global surface air temperature (deg. C) # relative to 1961-1990 average # (p. 1409) year HadCRUT4_Median 1850 -0.320 1860 -0.335 1870 -0.258 1880 -0.297 1890 -0.359 1900 -0.410 1910 -0.387 1920 -0.242 1930 -0.116 1940 -0.002 1950 -0.061 1960 -0.054 1970 -0.077 1980 0.095 1990 0.270 2000 0.453