• It was the warmest January–June on record (1880-2010 = 131 years) for the global land and ocean temperature. The worldwide land on average had its second warmest January–June, behind 2007. The worldwide averaged ocean temperature was the second warmest January–June, behind 1998.

The January–June 2010 map of temperature anomalies shows that for the first half of the year anomalous warm temperatures were present over much of the world, with the exception of cooler-than-average conditions across the higher-latitude southern oceans, the northern Pacific Ocean, along the western South American coast, Mongolia, northeastern China, the south central and southeastern U.S., central Russia, and parts of Scandinavia. The combined global average land and ocean surface temperature for January–June period was the warmest such period on record. This value is 0.68°C (1.22°F) above the 20^th century average. Separately, the average worldwide land surface temperature ranked as the second warmest on record, behind 2007, while the worldwide average ocean surface temperature ranked as the second warmest January–June on record—behind 1998.