Benson, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 8.6 °C (low) to 27.3 °C (high). Annual precipitation averages 314.2 Millimeters. Benson is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.3 °C | 17.8 °C | 21.08 mm |
| February | 0.8 °C | 19.4 °C | 19.3 mm |
| March | 3.8 °C | 22.9 °C | 13.46 mm |
| April | 6.4 °C | 27 °C | 7.11 mm |
| May | 10.3 °C | 31.4 °C | 4.32 mm |
| June | 16.3 °C | 36.7 °C | 8.64 mm |
| July | 19.8 °C | 36.1 °C | 73.15 mm |
| August | 19.3 °C | 34.6 °C | 70.1 mm |
| September | 15.8 °C | 33.1 °C | 42.93 mm |
| October | 8.9 °C | 28.7 °C | 17.53 mm |
| November | 3 °C | 22.7 °C | 14.99 mm |
| December | -0.4 °C | 17.2 °C | 21.59 mm |
| Annual | 8.6 °C | 27.3 °C | 314.2 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |