National Climate Report - May 2012
Warmest 12-month consecutive periods of the CONUS
« National Climate Report - May 2012
- Year-to-date Temperature Anomalies
- State-by-State: Warmest Seasons & Jan-May
- Divisional Temperature Maps
- Warmest 12-month consecutive periods of the CONUS
- Spring Daily Temperature Extremes
- Pre-Hurricane Season Tropical Cyclones
Warmest 12-month consecutive periods of the CONUS
These are the warmest 12-month periods on record for the contiguous United States. During the June 2011-May 2012 period, each of the 12 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 is 1 in 531,441.
| Rank | Consecutive 12-month Period | Temperature Departure (from 20th Century Average) |
|---|---|---|
| Warmest | June 2011 — May 2012* | +3.18°F |
| 2 Warmest | May 2011 – April 2012* | +2.83°F |
| 3rd Warmest | November 1999 – October 2000 | +2.70°F |
| 4th Warmest | October 1999 – September 2000 | +2.65°F |
| 5th Warmest | April 2011 – March 2012* | +2.61°F |
| 6th Warmest | September 2005 – August 2006 | +2.56°F |
| 7th Warmest | August 2005 – July 2006 | +2.54°F |
| September 1999 – August 2000 | +2.54°F | |
| 9th Warmest | July 1999 – June 2000 | +2.51°F |
| 10th Warmest | June 1999 – May 2000 | +2.46°F |
| August 1999 – July 2000 | +2.46°F |
* – Preliminary Data