Global warming: warmest 12-month periods U.S.

This statistic represents the warmest consecutive 12-month periods in the contiguous U.S. as of April 2012, based on temperature departure from the 20th century average. The period between November 1999 and October 2000 was around 2.7 degrees Fahrenheit warmer than the 20th century average.

Warmest consecutive 12-month periods in contiguous United States as of April 2012, based on temperature departure* (in Fahrenheit)

Characteristic	Temperature departure in Fahrenheit
May 2011 - April 2012**	2.8
November 1999 - October 2000	2.7
October 1999 - September 2000	2.65
April 2011 - March 2012**	2.61
September 2005 - August 2006	2.56
August 2005 - July 2006	2.54
September 1999 - August 2000	2.54
July 1999 - June 2000	2.51
June 1999 - May 2000	2.46
August 1999 - July 2000	2.46

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Release date

May 2012

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Region

United States

Survey time period

June 1999 to April 2012

Supplementary notes

* Data are based on temperature departure from the 20th century average.
** These figures are preliminary.
The contiguous U.S. (CONUS) are the 48 continental states and the District of Columbia.

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