Tropic, Utah has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 17.6 °C (high). Annual precipitation averages 322.8 Millimeters. 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 | -9.1 °C | 6 °C | 26.16 mm |
| February | -7.2 °C | 7.7 °C | 30.73 mm |
| March | -3.9 °C | 11.8 °C | 25.4 mm |
| April | -1.5 °C | 16.1 °C | 18.03 mm |
| May | 2.7 °C | 21.2 °C | 15.24 mm |
| June | 6.6 °C | 27.5 °C | 9.91 mm |
| July | 11.2 °C | 30.6 °C | 33.53 mm |
| August | 10.3 °C | 29.2 °C | 39.88 mm |
| September | 6.2 °C | 25.2 °C | 40.64 mm |
| October | 0.6 °C | 18.7 °C | 37.59 mm |
| November | -5.3 °C | 11.4 °C | 21.34 mm |
| December | -9 °C | 5.8 °C | 24.38 mm |
| Annual | 0.1 °C | 17.6 °C | 322.83 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |