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The USDA released a new hardiness zone map and half of the country has shifted. ... because it advises the average lowest winter temperature over a ... You simply type in your zip code and it ...
Temperature scale used to define USDA hardiness zones. These are annual extreme minima (an area is assigned to a zone by taking the lowest temperature recorded there in a given year). As shown, the USDA uses a GIS dataset averaged over 1976 to 2005 for its United States maps. Global Plant Hardiness Zones (approximate).
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Various hardiness ratings are published. In the United States (US), the most widely used is the U.S. Department of Agriculture (USDA) system of hardiness zones based on average minimum yearly temperatures. [4] This system was developed specifically for the extremely diverse range of conditions in the US, from baking desert to frozen tundra.
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According to the United States Department of Agriculture, the Plant Hardiness zone is 3b with an average annual extreme minimum temperature of −30.7 °F (−34.8 °C). [7] Summers are warm with chilly nights in the 30s and 40s (°F) and some thunderstorm activity during the months of July and August. Winters are cold and dry with lows below zero.
USDA plant hardiness maps, updated for the first time in a decade, show a 2.5-degree Fahrenheit increase in temperatures across the contiguous U.S.