Delta, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.5 °F (low) to 66.1 °F (high). Annual precipitation averages 8.5 Inches. Delta is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.3 °F | 39.0 °F | 0.53 in. |
| February | 21.1 °F | 45.8 °F | 0.71 in. |
| March | 27.7 °F | 56.8 °F | 0.76 in. |
| April | 32.8 °F | 64.1 °F | 0.94 in. |
| May | 41.5 °F | 74.3 °F | 0.98 in. |
| June | 49.9 °F | 85.8 °F | 0.67 in. |
| July | 59.0 °F | 94.3 °F | 0.36 in. |
| August | 57.4 °F | 92.1 °F | 0.57 in. |
| September | 46.5 °F | 81.8 °F | 0.72 in. |
| October | 34.2 °F | 67.6 °F | 0.9 in. |
| November | 24.0 °F | 52.1 °F | 0.65 in. |
| December | 15.8 °F | 39.6 °F | 0.68 in. |
| Annual | 35.5 °F | 66.1 °F | 8.47 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |