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The 1901-2000 average combined land and ocean annual temperature is 13.9°C (56.9°F), the annually averaged land temperature for the same period is 8.5°C (47.3°F), and the long-term annually averaged sea surface temperature is 16.1°C (60.9°F).
The following information was compiled from previous NCDC monitoring reports and public reports by National Hydrometeorological Services (NHMSs; peers of the U. National Weather Service), including those submitted to inform the Provisional Status of the Climate in 2015 by the World Meteorological Organization.
The warmth was due to the near-record strong El Niño that developed during the Northern Hemisphere spring in the eastern and central equatorial Pacific Ocean and to large regions of record warm and much warmer-than-average sea surface temperatures in parts of every major ocean basin.
This is not only the highest calendar year temperature, but also the highest temperature for any 12-month period on record.
The global temperatures in 2015 were strongly influenced by strong El Niño conditions that developed during the year.
Separately, temperatures were record warm across land surfaces as well.
The global land temperature for 2015 was 1.33°C (2.39°F) above the 20 century average, surpassing the previous records of 20 by 0.25°C (0.45°F).