Earth's average surface temperature was the warmest since record-keeping began in 1880, according to NASA and the National Oceanic and Atmospheric Administration.
December also was the warmest month ever recorded, and was among five months that set records, the agencies reported Friday.
The combined land and ocean surface temperature was 1.24 degrees Fahrenheit above the 20thcentury average, according to NOAA. The five months that set records were May, June, August, September and December, NOAA said. October tied for warmest, according to the agency's report.
The data add to a two-decade string of record warmth planet-wide. Except for 1998, the 10 warmest years on record have occurred since 2002, according to NOAA.
The increase in global average surface temperatures was driven in part by an all-time record year for ocean temperatures, and it came despite a decidedly colder winter driven by a "polar vortex" in much of the U.S., according to the agencies. That cold anomaly was overwhelmed by many other hot anomalies planet-wide, agency officials said.
Copyright © 2015, Los Angeles Times8:34 a.m: This story was updated with background on ocean temperatures.
This story was first published at 8:14 a.m.
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