For the second consecutive month, the U.S. has marked its warmest 12-month period on record.
Nationwide, the average temperature of 56 degrees from June 2011 to May 2012 was 3.2 degrees above-average. The previous record, set for the period of May 2011 to April 2012, was 0.4 degrees cooler. Three of the top-10 warmest 12-month periods on record have ended in 2012.
This is all according to a monthly "State of the Climate" report from the National Climatic Data Center.
The average for the year ending in May was particularly pushed upward by the fact that the meterological spring was the warmest on record for the country, just as it was at BWI Marshall Airport. It was also the hottest spring on record for all of Maryland and for 30 other states across the eastern two-thirds of the country.
That came after of the fourth-warmest winter and second-warmest summer on record nationwide.