It's not actually possible without making inferences via models. The NOAA recently switched their global temperature model [0]. [0] http://www.ncdc.noaa.gov/so

It's not actually possible without making inferences via models. The NOAA recently switched their global temperature model [0]. [0] http://www.ncdc.noaa.gov/sotc/global/2015/5/supplemental/page-1/ http://www.ncdc.noaa.gov/sotc/global/2015/5/supplemental/pag...