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The climatic zones were developed of the US Department of Agriculture and comprehend the average annual minimum temperatures from one zone, whereby each zone divided into 5,5ºC resp. 10 Fahrenheit. The temperature ranges to refer to their natural environment resp. range.
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Hardiness Zones
Annual Minimum Temperatures
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Zone
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Celsius: °C
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Fahrenheit: F
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1a
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unter -45,5 |
unter -50
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2a
2b
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-45,5 to -42,8
-42,7 to -40,1 |
-50 to -45
-45 to -40
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3a
3b
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-40,0 to -37,2
-37,1 to -34,5
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- 40 to -35
-35 to -30
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4a
4b
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-34,5 to -31,6
-31,5 to -28,9
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-30 to -25
-25 to -20
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5a
5b
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-28,8 to -26,1
-26,0 to -23,4
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-20 to -15
-15 to -10
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6a
6b
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-23,3 to -20,5
-20,4 to -17,8
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-10 to -5
-5 to 0
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7a
7b
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-17,7 to -15,0
-14,9 to -12,3
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0 to 5
5 to 10
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8a
8b
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-12,3 to -9,4
-9,3 to -6,7
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10 to 15
15 to 20
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9a
9b
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-6,6 to -3,9
-3,9 to -1,2
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20 to 25
25 to 30
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10a
10b
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-1,1 to 1,7
1,8 to 4,4
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30 to 35
35 to 40
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11a
11b
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4,4 to 7,2
7,1 to 10,0
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40 to 45
45 to 50
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12
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10,1 to +15,6
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50 to 60
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