Tsoon	Temperatuur °C
1	< -45.5
2	-45.5 to -40.1
3	-40.0 to -34.5
4	-34.4 to -28.9
5	-28.8 to -23.4
6	-23.3 to -17.8
7	-17.7 to -12.3
8	-12.2 to -6.7
9	-6.6 to -1.2
10	-1.1 to +4.4
11	>+4.4