National Overview - June 2012
Warmest 12-month consecutive periods for the CONUS

« National Overview - June 2012


Warmest 12-month consecutive periods for the CONUS

These are the warmest 12-month periods on record for the contiguous United States. During the June 2011-June 2012 period, each of the 13 months ranked among the warmest third of their historical distribution for the first time in the 1895-present record. The odds of this occurring randomly are 1 in 1,594,323. The July 2011-June 2012 12-month period surpassed the June 2011-May 2012 period as the warmest consecutive 12-months that the contiguous U.S. has experienced.


Warmest 12 months

Rank Consecutive 12-month Period Temperature Departure
(from 20th Century Average)
Warmest July 2011 — June 2012* +3.23°F
2nd Warmest June 2011 — May 2012* +3.18°F
3rd Warmest May 2011 – April 2012* +2.83°F
4th Warmest November 1999 – October 2000 +2.70°F
5th Warmest October 1999 – September 2000 +2.65°F
6th Warmest April 2011 – March 2012* +2.61°F
7th Warmest September 2005 – August 2006 +2.56°F
8th Warmest August 2005 – July 2006 +2.54°F
  September 1999 – August 2000 +2.54°F
10th Warmest July 1999 – June 2000 +2.51°F
11th Warmest June 1999 – May 2000 +2.46°F
  August 1999 – July 2000 +2.46°F

* – Preliminary Data