These maps show the difference from average seasonal temperatures in the Northern Hemisphere winter (December 2010-February 2011), spring (March-May), summer (June-August), and fall (September-November). Places cooler than the 1981-2010 average are blue, places where temperatures were near average are white, and places where temperatures were warmer than average are red. Based on Merged Land and Ocean Surface Temperature data from the National Climatic Data Center.