Zone One:

below -50° F

Zone Two:

-50° F to -40° F

Zone Three:

-40° F to -30° F

Zone Four:

-30° F to -20° F

Zone Five:

-20° F to -10° F

Zone Six:

-10° F to 0° F

Zone Seven:

0° F to 10° F

Zone Eight:

10° F to 20° F

Zone Nine:

20° F to 30° F

Zone Ten:

30° F to 40° F