San Simon, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 46.6 °F (low) to 80 °F (high). Annual precipitation averages 10 Inches. San Simon is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.2 °F | 60.4 °F | 0.83 in. |
| February | 32.2 °F | 65.1 °F | 0.8 in. |
| March | 37.3 °F | 72.2 °F | 0.46 in. |
| April | 42.8 °F | 80.2 °F | 0.22 in. |
| May | 50.9 °F | 89.0 °F | 0.14 in. |
| June | 60.5 °F | 98.0 °F | 0.38 in. |
| July | 67.2 °F | 97.1 °F | 1.83 in. |
| August | 66.0 °F | 95.0 °F | 2.09 in. |
| September | 60.2 °F | 90.9 °F | 0.91 in. |
| October | 47.5 °F | 82.2 °F | 0.73 in. |
| November | 36.0 °F | 69.6 °F | 0.61 in. |
| December | 29.4 °F | 59.7 °F | 1.01 in. |
| Annual | 46.6 °F | 80 °F | 10.01 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |