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Global Climate 2011: Warmest year with La Niña, 10th warmest year, lowest Arctic sea ice volume Average global temperatures this year so far are the 10th highest on record and are higher than all previous years with a La Niña event, which has a relative cooling effect, WMO reported

After cooling the eastern tropical Pacific for the second winter in a row-and teaming with other large-scale weather patterns to wreak havoc on North American winter-La Niña ended in April 2012. Researchers from the Climate Prediction Center of the U.S.

2011: world's 10th warmest year, warmest year with La Niña on record, second-lowest Arctic sea ice extent

Australia's meteorological service says its climate models indicate that the El Niño ocean-warming phenomenon may return later this year, replacing the stubborn La Niña that has altered global weather patterns for the past two years. El Niño brings its own set of weather disruptions, typically including drought from Australia to Indonesia and potent winter storms to the western United States.