This issue of WMO annual survey on weather and climate change provides evidence that 2011 had the highest global mean surface temperature levels in a La Niña year. Highlighting a number of climate extremes, it provides evidences of the major impacts of one of the strongest La Niña events of the past 60 years, among which are the significant flooding in South-East Asia and the major drought in East Africa. It also notes that Arctic sea ice continued its declining trend and returns on the destructive tornado seasons in the United States of America.