Reference: New: NOAA/NCDC Releases 2014 Global Climate Report and Graphics, Warmest Year on Record
From the National Climatic Data Center:
The globally averaged temperature over land and ocean surfaces for 2014 was the highest among all years since record keeping began in 1880, according to NOAA scientists. The December combined global land and ocean average surface temperature was also the highest on record.
The year 2014 was the warmest year across global land and ocean surfaces since records began in 1880. The annually-averaged temperature was 0.69°C (1.24°F) above the 20th century average of 13.9°C (57.0°F), easily breaking the previous records of 2005 and 2010 by 0.04°C (0.07°F). This also marks the 38th consecutive year (since 1977) that the yearly global temperature was above average. Including 2014, 9 of the 10 warmest years in the 135-year period of record have occurred in the 21st century. 1998 currently ranks as the fourth warmest year on record.
The 2014 global average ocean temperature was also record high, at 0.57°C (1.03°F) above the 20th century average of 16.1°C (60.9°F), breaking the previous records of 1998 and 2003 by 0.05°C (0.09°F). Notably, ENSO-neutral conditions were present during all of 2014.
The 2014 global average land surface temperature was 1.00°C (1.80°F) above the 20th century average of 8.5°C (47.3°F), the fourth highest annual value on record.
Precipitation measured at land-based stations around the globe was near average on balance for 2014, at 0.52 mm below the long-term average. However, as is typical, precipitation varied greatly from region to region. This is the third consecutive year with near-average global precipitation at land-based stations.
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