San Simon, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.1 °C (low) to 26.7 °C (high). Annual precipitation averages 254.2 Millimeters. 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 | -1.6 °C | 15.8 °C | 21.08 mm |
| February | 0.1 °C | 18.4 °C | 20.32 mm |
| March | 2.9 °C | 22.3 °C | 11.68 mm |
| April | 6 °C | 26.8 °C | 5.59 mm |
| May | 10.5 °C | 31.7 °C | 3.56 mm |
| June | 15.8 °C | 36.7 °C | 9.65 mm |
| July | 19.6 °C | 36.2 °C | 46.48 mm |
| August | 18.9 °C | 35 °C | 53.09 mm |
| September | 15.7 °C | 32.7 °C | 23.11 mm |
| October | 8.6 °C | 27.9 °C | 18.54 mm |
| November | 2.2 °C | 20.9 °C | 15.49 mm |
| December | -1.4 °C | 15.4 °C | 25.65 mm |
| Annual | 8.1 °C | 26.7 °C | 254.24 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |