Tombstone, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 49 °F (low) to 78 °F (high). Annual precipitation averages 12.6 Inches. Tombstone is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.6 °F | 61.3 °F | 0.84 in. |
| February | 35.8 °F | 64.1 °F | 0.73 in. |
| March | 40.2 °F | 70.2 °F | 0.57 in. |
| April | 45.2 °F | 77.7 °F | 0.21 in. |
| May | 53.1 °F | 85.9 °F | 0.18 in. |
| June | 62.6 °F | 94.7 °F | 0.55 in. |
| July | 66.5 °F | 92.8 °F | 2.73 in. |
| August | 65.3 °F | 90.5 °F | 3.0 in. |
| September | 60.6 °F | 88.1 °F | 1.54 in. |
| October | 50.5 °F | 80.7 °F | 0.63 in. |
| November | 40.5 °F | 69.9 °F | 0.66 in. |
| December | 33.7 °F | 60.6 °F | 0.95 in. |
| Annual | 49 °F | 78 °F | 12.59 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |