February 2012 Global Climate Report

February 2012 Selected Climate
Anomalies and Events Map

Global Highlights

• The combined average temperature over global land and ocean surfaces for February 2012 was the 22^nd warmest on record and the coolest since 2008, at 12.47°C (54.57°F), which is 0.37°C (0.67°F) above the 20^th century average of 12.1°C (53.9°F).
  
• Separately, the global land surface temperature was 0.38°C (0.68°F) above the 20^th century average of 3.2°C (37.8°F), making this the 37^th warmest February on record and the coolest February since 1994. It was also the coolest month on record since January 2008.
  
• For the ocean, the February global sea surface temperature was 0.36°C (0.65°F) above the 20^th century average of 15.9°C (60.6°F), making it the 12^thth warmest February on record.
  
• The combined global land and ocean average surface temperature for the December–February period was 0.41°C (0.74°F) above the 20th century average of 12.1°C (53.8°F), making it the 17^th warmest such period on record and the coolest December–February since 2008.
  
• The December–February worldwide land surface temperature was 0.59°C (1.06°F) above the 20^th century average, the 20^th warmest such period on record. The global ocean surface temperature for the same period was 0.33°C (0.59°F) above the 20^th century average and was the 15^th warmest such period on record.
  
• The combined global land and ocean average surface temperature for the January–February period was 0.37°C (0.67°F) above the 20^th century average of 12.1°C (53.8°F), making it the 20^th warmest such period on record.
  
• The January–February worldwide land surface temperature was 0.43°C (0.77°:F) above the 20^th century average, the 33^rd warmest such period on record. The global ocean surface temperature for the year to date was 0.34°C (0.61°F) above the 20^th century average and was the 14^th warmest such period on record.
  

Please Note: The data presented in this report are preliminary. Ranks and anomalies may change as more complete data are received and processed. Effective with the July 2010 State of the Climate Report, NCDC transitioned to the new version (version 3b) of the extended reconstructed sea surface temperature (ERSST) dataset. ERSST.v3b is an improved extended SST reconstruction over version 2. For more information about the differences between ERSST.v3b and ERSST.v2 and to access the most current data, please visit NCDC's Global Surface Temperature Anomalies page.

Introduction

Temperature anomalies for February 2012 and December 2011 – February 2012 are shown on the dot maps below. The dot maps on the left provide a spatial representation of anomalies calculated from the Global Historical Climatology Network (GHCN) dataset of land surface stations using a 1961–1990 base period. The dot maps on the right are a product of a merged land surface and sea surface temperature (SST) anomaly analysis developed by Smith et al. (2008). For the merged land surface and SST analysis, temperature anomalies with respect to the 1971–2000 average for land and ocean are analyzed separately and then merged to form the global analysis. For more information, please visit NCDC's Global Surface Temperature Anomalies page.

Temperatures

In the atmosphere, 500-millibar height pressure anomalies correlate well with temperatures at the Earth's surface. The average position of the upper-level ridges of high pressure and troughs of low pressure—depicted by positive and negative 500-millibar height anomalies on the February 2012 map—is generally reflected by areas of positive and negative temperature anomalies at the surface, respectively.

February

February 2012 Land Surface Temperature
Anomalies in degrees Celsius

February 2012 Blended Land and Sea Surface
Temperature Anomalies in degrees Celsius

During February 2012, many land areas around the globe, especially in the Northern Hemisphere, saw extreme warm or extreme cold temperatures compared with their averages. The temperature departures were due at least in part to a negative phase of the Arctic Oscillation during the first half of the month that was associated with a long and severe cold snap to Central and Eastern Europe. Anomalous cold stretched across most of the 40°N–55°N latitude belt of Europe and Asia. It was also much colder than normal across eastern Russia to the northeast. Conversely, all of Canada, the eastern half of the United States, and north central Russia saw much warmer-than-average temperatures. The average Northern Hemisphere land temperature was 0.31°C (0.56°F) above normal, the 45^th warmest February for this region since records began in 1880. February 2012 also marks the coolest February since 1994 for the Northern Hemisphere. In the Southern Hemisphere, which contains much less land mass than its counterpart, Australia had cooler-than-average temperatures while parts of southern South America were warmer than normal, contributing to the February Southern Hemisphere temperature anomaly of 0.56°C (1.01°F)—the 12^th warmest February on record. Combining the two hemispheres, the average global temperature over land in February was 5.58°C (37.68°F), which is 0.38°C (0.68°F) above the 20^th century average and the 37^th warmest February on record.

• The average Febraury temperature across Spain was 2.5°C (4.5°F) below the 1971–2000 period of reference, representing the fourth coldest February on record since 1961.The average minimum temperature for the month was the lowest since 1956.


• Austria's average February temperature was 3.9°C (7.0°F) below the 1971–2000 period of reference, the coldest February on record since 1986. It is notable that the temperature during the first half of the month was about 10°C (18.0°F) below average and then warmed susbstantially during the latter half.


• Both Scotland and Northern Ireland reported their warmest Februaries since 1998. For Northern Ireland, this marks it fourth warmest February on record.


• Germany experienced its coldest February since 1986 and 15^th coldest since records began in 1881. The average temperature was 3.4°C below the 1981–2010 period of reference.


• According to Environment Canada, the average temperature in Ontario during February "rivaled record values set in 1998". Average temperatures across the region ranged from 3.7°C to 6.8°C (6.7°F to 12.2°F) above average.


• Australia reported its lowest nationally-averaged minimum temperature since 1990. It was the eighth coolest since records began in 1950. The state of Queensland in the northeast of the country observed its third coolest February minimum temperatures on record while Tasmania in the southeast experienced its eighth warmest.

Global ocean temperatures remained fairly steady in comparison with recent months. According to NOAA's Climate Prediction Center, La Niña continued to weaken across the east central equatorial Pacific Ocean, as is evident by the above blended land and sea surface temperature anomaly dot map. The cooler-than-average temperatures are warmer in this region compared with January, and in fact above average in parts of the eastern equatorial Pacific. Warmer-than-average temperatures were also observed across the north central Pacific, the North Atlantic, much of the eastern Indian Ocean, and portions of the mid-latitude Southern oceans. During February, the average temperature across the world's oceans was 0.36°C (0.65°F) above the long-term average, the 12^th warmest February on record. By comparison, February 2011, which also saw a weakening La Niña, ranked as 10^th warmest. The current La Niña is expected to dissipate by the end of April this year.

February Global Land and Ocean plot

February Global Hemisphere plot

Season (December–February)

December 2010 – February 2012 Land Surface
Temperature Anomalies in degrees Celsius

December 2010 – February 2012 Blended Land and
Sea Surface Temperature Anomalies in
degrees Celsius

Two large-scale climate patterns—the Arctic Oscillation (AO) and La Niña—influenced temperatures around the globe during December 2011–February 2012 (boreal winter/austral summer). The AO, which impacts weather patterns in the Northern Hemisphere, was primarily positive during the three-month period, keeping cold Arctic air tightly contained in the polar regions; however, there was a three-week period during late January to mid-February when the AO turned negative and was associated with record-breaking cold and snow to Central and Eastern Europe. On average, warmer-than-normal temperatures were observed across most of North America, most of northern Europe and Asia, and southern South America. Cooler-than-normal temperatures were felt across western and central Alaska, far eastern Russia, the Middle East, central and eastern mainland Asia, the southern half of Australia, and northwestern Africa. Overall, the average December–February 2011/12 temperature over land surfaces was 0.59°C (1.06°F) above the 20^th century average, marking the 20^th warmest such period on record.

• Norway reported its 23^rd warmest winter in its 113-year period of record, with the average temperature 2.0°C (3.6°F) above normal.


• The contiguous United States reported its fourth mildest winter since records began in 1895, with the average temperature 2.2°C (3.9°F).


• Australia reported its 11^th coolest maximum and 15^th coolest minimum summer temperatures in the country's 63-year period of record. La Niña conditions contributed to the second coolest February minimum temperature for the southeastern state of New South Wales.

Across the oceans, cool La Niña waters influenced sea surface temperatures during December–February. Even so, the globally-averaged temperature was 0.34°C (0.61°F) above the 20^th century average, the 15^th warmest such period on record. Combining land and ocean temperatures, the global average temperature was the 17^th warmest on record, 0.41°C (0.74°F) above average.

December–February Global Land and Ocean plot

December–February Global Hemisphere plot

Year-to-date (January–February)

Falling within the December 2011–February 2012 period discussed above, the January–February 2012 temperature anomalies were rather similar to the 2011/12 boreal winter/austral summer months around the globe. For the year to date, the average global land surface temperature ranked as the 33^rd warmest such period on record, while the average sea surface temperature ranked as 14^th warmest. Combined, the globally-averaged temperature across all land and ocean surfaces was 0.37°C (0.67°F) above the 20^th century average, the 20^th warmest January–February on record.

January–February Global Land and Ocean plot

January–February Global Hemisphere plot

The most current data may be accessed via the Global Surface Temperature Anomalies page.

Images of sea surface temperature conditions are available for all weeks during 2012 from the weekly SST page.

Precipitation

The maps below represent anomaly values based on the GHCN dataset of land surface stations using a base period of 1961–1990. During February 2012, above-average precipitation fell over areas that included part of the south central United States and Mexico, portions of South America, the Philippines, southeastern Australia, and Madagascar, where Tropical Cyclone Giovanna dropped heavy rainfall. Lower-than-average precipitation was observed over areas that included much of Western Europe, eastern Brazil, and the eastern United States.

During the seasonal period December 2011 – February 2012, above-average precipitation fell over areas that included much of Northern and Eastern Europe, Malaysia, southeastern Australia, parts of northern South America, and the south central United States. Drier-than-average conditions were observed across several regions during December 2011 – February 2012, including southern Europe, eastern Brazil, and Pakistan.

February 2012 Precipitation Anomalies in Millimeters

December 2011 – February 2012 Precipitation
Anomalies in Millimeters

• In Western Europe, France reported its driest February since 1959, Spain reported its driest since 2000, and England had its driest February since 1998.


• Norway reported its 35^th wettest February and 22^nd wettest winter, at 35 percent and 25 percent above average, respectively, since records began in 1900.


• Precipitation was variable for the summer across New Zealand. According to NIWA, it was very wet across the North Island and extremely dry over the southwestern portion of South Island; the northern towns of Nelson and Takaka on South Island reported their wettest summers on record.


• February rainfall in Australia was 11.9 percent below average, ranking as the 44^th driest February on record. For the entire summer season (December–February), however, rainfall was 16 percent above average for the country as a whole, making this the 22^nd wettest summer since records began in 1900. The eastern Australian states of Queensland, New South Wales, and Victoria saw heavy flooding during February due to the monsoonal trough and ongoing La Niña effects.

Additional details on flooding and drought events around the world can also be found on the February 2012 Global Hazards page.

References

Peterson, T.C. and R.S. Vose, 1997: An Overview of the Global Historical Climatology Network Database. Bull. Amer. Meteorol. Soc., 78, 2837-2849.

Quayle, R.G., T.C. Peterson, A.N. Basist, and C. S. Godfrey, 1999: An operational near-real-time global temperature index. Geophys. Res. Lett., 26, 333-335.

Smith, T.M., and R.W. Reynolds (2005), A global merged land air and sea surface temperature reconstruction based on historical observations (1880-1997), J. Clim., 18, 2021-2036.

Smith, et al (2008), Improvements to NOAA's Historical Merged Land-Ocean Surface Temperature Analysis (1880-2006), J. Climate., 21, 2283-2293.

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