AHS Heat Zones
In addition to the USDA Hardiness zones there are the American Horticultural Society (AHS) Heat Zones.
The criterion is the average number of days per year when the temperature exceeds 30°C (86°F). The AHS Heat Zone Map for the US is available on the American Horticultural Society website.
| Zone | From | To |
| 1 | < 1 | |
| 2 | 1 | 7 |
| 3 | 8 | 14 |
| 4 | 15 | 30 |
| 5 | 31 | 45 |
| 6 | 46 | 60 |
| 7 | 61 | 90 |
| 8 | 91 | 120 |
| 9 | 121 | 150 |
| 10 | 151 | 180 |
| 11 | 181 | 210 |
| 12 | >210 | |
Read more about this topic: Hardiness Zone
Famous quotes containing the words heat and/or zones:
“As in hoary winter’s night stood shivering in the snow,
Surprised I was with sudden heat which made my heart to glow;
And lifting up a fearful eye to view what fire was near,
A pretty Babe all burning bright did in the air appear;”
—Robert Southwell (1561?–1595)
“The technological landscape of the present day has enfranchised its own electorates—the inhabitants of marketing zones in the consumer goods society, television audiences and news magazine readerships... vote with money at the cash counter rather than with the ballot paper at the polling booth.”
—J.G. (James Graham)