The U.S. Department of Agriculture’s ” plant hardiness zone map ” was updated Wednesday for the first time in a decade, and it shows the impact that climate change will have on gardens and yards across the country. One key figure on the map is the lowest likely winter temperature in a given region, which is important for determining which plants may survive the season. It's calculated by averaging the lowest winter temperatures of the past 30 years. Winter temperatures and nighttime temperatures are rising faster than daytime and summer temperatures, Primack said, which is why the lowest winter temperature is changing faster than the U.S. temperature overall. “There are a lot of downsides to the warmer winter temperatures, too,” said Theresa Crimmins, who studies climate change and growing seasons at the University of Arizona and was not involved in creating the map.

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Persons: Chris Daly, Richard Primack, ” Primack, Primack, ”, Theresa Crimmins Organizations: WASHINGTON, The U.S . Department, Oregon, Agricultural Research Service, Boston University, University of Arizona, Associated Press Health, Science Department, Howard Hughes Medical Institute’s Science, Educational Media Group, AP Locations: Boston, The, U.S