By James Gerken / Source: HuffingtonPost

2014 was the hottest year in 135 years of record-keeping, the National Oceanic and Atmospheric Administration and NASA announced on Friday.

The year’s average combined global land and ocean surface temperature was 58.24 degrees Fahrenheit, according to NOAA. This is 1.24 F above the 20th-century average. Global average land temperatures were 1.80 F above average, while ocean surface temperatures were 1.03 F above average, the agency said. Land temperatures alone were only the fourth-warmest on record, but ocean temperatures were the warmest, which helped to make 2014 the warmest year overall.

NOAA and NASA record temperature observations independently, but both agencies confirmed 2014 to be a record-breaking year. NASA reported 2014’s average temperature to be 58.42 F, which the agency reported was 1.22 F above a 1951-1980 average.

Previously, 2010 and 2005 held the record, but the 2014 temperature edged out both years by 0.07 F. The 10 warmest years on record have all been after 1998, and 2014 marked the 38th straight year with global average temperatures above the 20th-century average.

Six months in 2014 also set monthly global heat records: May, June, August, September, October and December of last year were all the warmest such months on record.

“Viewed in context, the record 2014 temperatures underscore the undeniable fact that we are witnessing, before our eyes, the effects of human-caused climate change,” climate scientist Michael Mann told The Huffington Post. “It is exceptionally unlikely that we would be seeing a record year, during a record-warm decade, during a multidecadal period of warmth that appears to be unrivaled over at least the past millennium, if it were not for the rising levels of planet-warming gases produced by fossil fuel burning.”

For the U.S. alone, as opposed to the planet overall, 2014 was only the 34th warmest year on record. But temperatures in the U.S. that year still exceeded the country’s 20th-century average, for the 18th consecutive year.

Seventeen major U.S. metropolitan areas, representing 9 percent of the country’s population, were on track to have their warmest years on record, as of a December 2014 analysis from Climate Central. Ten of these 17 are located in California, one of five states that were projected to have one of their top five warmest years in 2014.

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