NOAA - Globally, Hottest May On Record, Hottest Boreal Spring On Record, Hottest Jan-May On Record
NOAAs latest monthly report on global temperatures confirms that we are headed toward a record-smashing year.
Here are some of the new records for combined average temperature over global land and ocean surfaces that NOAA reports were just broken:
Hottest May in the 136-year period of record, at 0.87°C (1.57°F) above the 20th century average of 14.8°C (58.6°F), surpassing the previous record set just one year ago by 0.08°C (0.14°F).
Hottest MarchMay (boreal spring) on record, at 0.85°C (1.53°F) above the 20th century average of 13.7°C (56.7°F), surpassing the previous record warmth of MarchMay 2010 by 0.04°C (0.07°F).
Hottest January-May on record by far at 0.85°C (1.53°F) above the 20th century average, surpassing the previous record set in 2010 by 0.09°C (0.16°F).
So far, this year is blowing past every other year in terms of global temperatures. And as NOAA notes, 2010 was the last year with El Niño conditions; however El Niño was ending at this point in 2010, while it appears to be maturing at the same point in 2015.
EDIT
http://thinkprogress.org/climate/2015/06/18/3671271/noaa-hottest-may-spring-record/