For my area (rural) this means the actual temperature reported as «official» the next day after «adjusting» is raised any where from 2 to 4 °F. (joannenova.com.au)
The 2014 Global Temperature Report by the Earth System Science Center of the University of Alabama in Huntsville (Blue is cold; red warm -RCB-. (fabiusmaximus.com)
Moreover, the maximum air temperature they report for the 20th century was in 1938, when it was nearly four - tenths of a degree Fahrenheit warmer than the air temperature in 2000. (washingtontimes.com)