The 12-month period from December 2009 through November 2010 was the warmest on record globally, according to NASA's Goddard Institute for Space Studies. The average land and ocean combined temperature anomaly for the period was .65 Celsius or 1.17 F above the 1951-1980 global mean, beating the previous warmest 12-month period of +.62 Celsius during 2005. Third place is currently held by 2007 with a reading of +.61 Celsius. The maps below show the northern and southern hemispheric temperature anomalies for the Dec 2009 to Nov 2010 period. Red areas show the warmest regions relative to normal.
The GISS regional temperature anomaly graph below shows that most of the warming over the past century has occurred over the far northern latitudes.
The latest GISS 12-month global temperature anomaly trend
Here is a link to the GISS data.