Sea surface temperatures (SST) during March 2010 were warmer than average across much of the world's oceans, with the cooler-than-average conditions across the higher-latitude southern oceans, across parts of the northern Pacific Ocean, and along the western coast of South America. Warmer-than-average conditions were most pronounced in the equatorial portions of the oceans, where the tropical ocean surface temperature (equatorward of 20 degrees latitude) also had its warmest March on record. The March 2010 worldwide SST ranked as the warmest on record, with an anomaly of 0.56°C (1.01°F) above the 20th century average—the previous record was set in 1998.
http://www.ncdc.noaa.gov/sotc/?report=global
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