Wednesday, January 16, 2013

Year 2012 Global Temperature Anomalies

From NCDC/NOAA:  Year 2012 Climate Summary

Global Temperatures

2012 marks the 36th consecutive year (since 1976) that the annual temperature was above the long-term average. Currently, the warmest year on record is 2010, which was 0.66°C (1.19°F) above average. Including 2012, all 12 years to date in the 21st century (2001–2012) rank among the 14 warmest in the 133-year period of record. Only one year during the 20th century—1998—was warmer than 2012.  Link to video summarizing the global climate of 2012.

The year 2012 was the 10th warmest year since records began in 1880. The annually-averaged temperature across global land and ocean surfaces was 0.57°C (1.03°F) above the 20th century average. Record to near-record warm land surface temperatures in the Northern Hemisphere from April to September and overall warmer-than-average ocean surface temperatures made the first 11 months of the year the eighth warmest January–November on record. However, extreme cold across much of the Northern Hemisphere land during December helped lower the year-to-date temperature departure from average by 0.02°C (0.04°F) compared with the previous month.


Global Highlights

  • The year 2012 was the 10th warmest year since records began in 1880. The annual global combined land and ocean surface temperature was 0.57°C (1.03°F) above the 20th century average of 13.9°C (57.0°F). This marks the 36th consecutive year (since 1976) that the yearly global temperature was above average. Currently, the warmest year on record is 2010, which was 0.66°C (1.19°F) above average. Including 2012, all 12 years to date in the 21st century (2001–2012) rank among the 14 warmest in the 133-year period of record. Only one year during the 20th century—1998—was warmer than 2012.

  • Separately, the 2012 global average land surface temperature was 0.90°C (1.62°F) above the 20th century average of 8.5°C (47.3°F) and ranked as the seventh warmest year on record.

  • La Niña, which is defined by cooler-than-normal waters in the eastern and central equatorial Pacific Ocean that affect weather patterns around the globe, was present during the first three months of 2012. The weak-to-moderate La Niña dissipated in the spring and was replaced by ENSO-neutral conditions for the remainder of the year. When compared to previous La Niña years, the 2012 global surface temperature was the warmest observed during such a year; 2011 was the previous warmest La Niña year on record.

  • The 2012 global average ocean temperature was 0.45°C (0.81°F) above the 20th century average of 16.1°C (60.9°F) and ranked as the 10th warmest year on record. It was also the warmest year on record among all La Niña years. The three warmest annual ocean surface temperatures occurred in 2003, 1998, and 2010—all warm phase El Niño years.

  • Following the two wettest years on record (2010 and 2011), 2012 saw near average precipitation on balance across the globe. However, as ia typical, precipitation varied greatly from region to region.


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