Copyright © 2006 Earth Policy Institute (Note: this Indicator was updated in 2008.) March 28, 2006 2005 Hottest Year on Record Joseph Florence * The year 2005 was the hottest on record. The average global surface temperature of 14.77 degrees Celsius (58.6 degrees Fahrenheit) was the highest since recordkeeping began in 1880. January, April, September, and October of 2005 were the hottest of th