Magna, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 41.6 °F (low) to 64 °F (high). Annual precipitation averages 17 Inches. Magna is located in USDA Plant Hardiness Zone 7b. 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 | 22.2 °F | 38.6 °F | 1.29 in. |
| February | 26.0 °F | 44.0 °F | 1.22 in. |
| March | 33.7 °F | 54.1 °F | 1.55 in. |
| April | 38.8 °F | 60.8 °F | 2.45 in. |
| May | 47.3 °F | 71.1 °F | 2.11 in. |
| June | 55.6 °F | 82.5 °F | 1.61 in. |
| July | 65.3 °F | 92.4 °F | 0.7 in. |
| August | 63.0 °F | 90.8 °F | 0.76 in. |
| September | 53.3 °F | 79.7 °F | 1.17 in. |
| October | 41.2 °F | 64.7 °F | 1.55 in. |
| November | 30.3 °F | 50.3 °F | 1.32 in. |
| December | 23.0 °F | 39.2 °F | 1.24 in. |
| Annual | 41.6 °F | 64 °F | 16.97 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |