Cornish, Utah has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 60.2 °F (high). Annual precipitation averages 16.3 Inches. Cornish is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.8 °F | 32.3 °F | 1.74 in. |
| February | 17.5 °F | 37.3 °F | 1.41 in. |
| March | 27.1 °F | 49.5 °F | 1.54 in. |
| April | 33.1 °F | 58.5 °F | 1.85 in. |
| May | 40.3 °F | 68.0 °F | 2.25 in. |
| June | 46.8 °F | 78.9 °F | 1.14 in. |
| July | 53.4 °F | 89.1 °F | 0.57 in. |
| August | 51.8 °F | 87.9 °F | 0.75 in. |
| September | 43.2 °F | 77.6 °F | 1.3 in. |
| October | 33.0 °F | 62.6 °F | 1.45 in. |
| November | 24.2 °F | 46.8 °F | 1.13 in. |
| December | 15.8 °F | 33.7 °F | 1.21 in. |
| Annual | 33.3 °F | 60.2 °F | 16.34 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |