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May 16, 2008 
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Climate ZonesClimate zones


Map


USDA Hardiness Zones and Average Annual Minimum Temperature Range

USDA Zone Temperature Range
        1
 Below -50 F (below -45.6C)
        2a 
-50 to -45 F (-42.8 to -45.5 C) 
        2b 
-45 to -40 F (-40.0 to -42.7 C) 
        3a 
-40 to -35 F (-37.3 to -39.9 C) 
        3b 
-35 to -30 F (-34.5 to -37.2 C) 
        4a 
-30 to -25 F (-31.7 to -34.4 C) 
        4b 
-25 to -20 F (-28.9 to -31.6 C) 
        5a 
-20 to -15 F (-26.2 to -28.8 C) 
        5b 
-15 to -10 F (-23.4 to -26.1 C) 
        6a 
-10 to -5 F (-20.6 to -23.3 C) 
        6b 
-5 to 0 F (-17.8 to -20.5 C) 
        7a 
0 to 5 F (-15.0 to -17.7 C) 
        7b 
5 to 10 F (-12.3 to -14.9 C) 
        8a 
10 to 15 F (-9.5 to -12.2 C) 
        8b 
15 to 20 F (-6.7 to -9.4 C) 
        9a 
20 to 25 F (-3.9 to -6.6 C) 
        9b 
25 to 30 F (-1.2 to -3.8 C) 
       10a 
30 to 35 F (1.6 to -1.1 C) 
       10b 
35 to 40 F (4.4 to 1.7 C) 
       11 
above 40 F (above 4.5 C) 



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