Tropic, Utah has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 63.7 °F (high). Annual precipitation averages 12.7 Inches. Tropic 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 | 15.7 °F | 42.8 °F | 1.03 in. |
| February | 19.1 °F | 45.8 °F | 1.21 in. |
| March | 24.9 °F | 53.2 °F | 1.0 in. |
| April | 29.3 °F | 61.0 °F | 0.71 in. |
| May | 36.9 °F | 70.2 °F | 0.6 in. |
| June | 43.8 °F | 81.5 °F | 0.39 in. |
| July | 52.2 °F | 87.1 °F | 1.32 in. |
| August | 50.6 °F | 84.6 °F | 1.57 in. |
| September | 43.1 °F | 77.3 °F | 1.6 in. |
| October | 33.1 °F | 65.6 °F | 1.48 in. |
| November | 22.5 °F | 52.6 °F | 0.84 in. |
| December | 15.8 °F | 42.4 °F | 0.96 in. |
| Annual | 32.3 °F | 63.7 °F | 12.71 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |