Sorry, the latest data I could find was for 1999. I hope this helps! :-) The average temperature of Earth's surface has varied between 13.8 and 14.6 degrees Celsius (56.8 and 58.3 degrees Fahrenheit) during the period from 1950 to 1999. In the year 1999, the average global temperature was approximately 14.4 degrees Celsius (57.9 degrees Fahrenheit).