Tombstone, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9.4 °C (low) to 25.6 °C (high). Annual precipitation averages 319.8 Millimeters. 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 | 0.9 °C | 16.3 °C | 21.34 mm |
| February | 2.1 °C | 17.8 °C | 18.54 mm |
| March | 4.6 °C | 21.2 °C | 14.48 mm |
| April | 7.3 °C | 25.4 °C | 5.33 mm |
| May | 11.7 °C | 29.9 °C | 4.57 mm |
| June | 17 °C | 34.8 °C | 13.97 mm |
| July | 19.2 °C | 33.8 °C | 69.34 mm |
| August | 18.5 °C | 32.5 °C | 76.2 mm |
| September | 15.9 °C | 31.2 °C | 39.12 mm |
| October | 10.3 °C | 27.1 °C | 16 mm |
| November | 4.7 °C | 21.1 °C | 16.76 mm |
| December | 0.9 °C | 15.9 °C | 24.13 mm |
| Annual | 9.4 °C | 25.6 °C | 319.78 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |