Last Year Wasn’t Just Hot – It Was a Habanero: Chart

To say that 2012 was hot is an understatement. The average temperature in the contiguous U.S. last year was 55.3 degrees Fahrenheit, 3.2 degrees hotter than the 20th century average and 1 degree hotter than the previous record.

One degree may not sound sound like much, but the chart above, by NOAA's National Climatic Data Center, shows just what a big deal it really is. Each line displays year-to-date temperature anomalies, going back to 1895. Significant deviations from the average temperature are rare; a small fraction of a degree separates each year. Just 0.2 degree separates the previous record average temperature holder -- 54.3 degrees in 1998 -- from the one before that, 1934.