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2017 global temperatures are once again one of the hottest on record

CNN logo CNN 1/18/2018 By Brandon Miller, CNN Meteorologist
a close up of text on a white background © NOAA

2017 was once again one of the hottest years on record, ranked as the second-warmest by NASA and third-warmest by the National Oceanic and Atmospheric Administration.

Temperature records for the planet, monitored independently by both agencies, go back to 1880. The announcement came in a joint press conference on Thursday in Washington.

The hottest year on record remains 2016, while 2015 ranks second according to NOAA and third by NASA, which means the top three years have been the most recent three.

Though 2017 was slightly cooler on average compared to 2016. the trend towards a warmer planet has never been clearer.

The six hottest years have all occurred since 2010 and 17 of the 18 hottest years on record have occurred since 2001.

According to NOAA, the globally averaged temperature of the land and ocean was 0.84˚C (1.51˚F) above the 20th century average. This puts us more than halfway to the ambitious target of 1.5˚ C (2.7˚F) of warming set in the 2016 Paris Climate Agreement.

La Niña not enough to cool us down

The slight downturn in temperatures this year can be partially explained by the presence of La Niña, which began in late 2016 and lasted into 2017-- whereas a robust El Niño was in place during portions of 2015 and 2016.

El Niño is characterized by a warming of the surface waters in the tropical Pacific Ocean -- which tends to drive up global temperatures. Therefore years containing El Niños tend to be warmer globally than other years.

La Niñas, on the other hand, feature cooler than average waters in the Pacific, and tend to cool the planet down.

The fact that 2017 was the second- or third-warmest year on record, despite the presence of a cooling La Niña, speaks to the overall warming trend the Earth is experiencing thanks to overall global warming.

Global climate highlights of 2017

Sea ice continued its declining trend, both in the Arctic and Antarctic. The Antarctic, which was trending at record high levels just a few years ago, reached a record low during 2017, with ice covering 154,000 fewer square miles than the previous record low set in 1986.

In the Arctic, sea ice extent was the second-lowest since records began in 1979, behind only 2016, though record low sea ice was observed during the winter months of January-March.

Temperatures significantly warmer than normal around the planet did not mean there was a lack of snow, however. In the northern hemisphere, the average snow cover extent was the largest since 1985 and the eighth largest since records began in 1968, according to Rutgers University's Global Snow Lab.

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