Tacna, Arizona has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 14.1 °C (low) to 31.1 °C (high). Annual precipitation averages 92.7 Millimeters. Tacna is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.6 °C | 20.8 °C | 10.41 mm |
| February | 6.2 °C | 22.7 °C | 12.45 mm |
| March | 9.1 °C | 26.4 °C | 10.41 mm |
| April | 11.9 °C | 30.1 °C | 2.29 mm |
| May | 16.1 °C | 34.4 °C | 1.02 mm |
| June | 20.6 °C | 39.4 °C | 0.76 mm |
| July | 25.8 °C | 41.6 °C | 9.4 mm |
| August | 26.2 °C | 41.3 °C | 11.68 mm |
| September | 22.4 °C | 38.7 °C | 9.91 mm |
| October | 14.9 °C | 32.7 °C | 7.11 mm |
| November | 7.9 °C | 25.5 °C | 7.11 mm |
| December | 3.8 °C | 19.8 °C | 10.16 mm |
| Annual | 14.1 °C | 31.1 °C | 92.71 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BWh - Hot Desert Climate |