I've seen a lot of news coverage referring to 2012 as the hottest year on record, and some are more careful to say hottest year on record in the United States. Click here to see a graph of temperatures for the United States from NOAA. Even assuming that the temperature records do not reflect problems with weather station siting (like the end of jet runways and urban heat island effects), you can see that 1934 was distinctly warmer than 2012.
UPDATE: A reader points out that graph is for May; if you include July or August, 2012 is the warmest. I don't immediately see a way to get a whole year average there.