Monroe, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.2 °C (low) to 18.5 °C (high). Annual precipitation averages 230.6 Millimeters. Monroe is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | 5.1 °C | 15.49 mm |
| February | -5.9 °C | 8.3 °C | 16 mm |
| March | -2.9 °C | 13.3 °C | 21.84 mm |
| April | -0.1 °C | 16.9 °C | 20.83 mm |
| May | 4.1 °C | 22.3 °C | 20.32 mm |
| June | 8.8 °C | 28.7 °C | 12.95 mm |
| July | 12.9 °C | 32.5 °C | 14.22 mm |
| August | 12.1 °C | 31.3 °C | 27.94 mm |
| September | 6.9 °C | 26.8 °C | 16.26 mm |
| October | 0.8 °C | 19.5 °C | 35.31 mm |
| November | -4.4 °C | 11.7 °C | 14.99 mm |
| December | -8.8 °C | 5.2 °C | 14.48 mm |
| Annual | 1.2 °C | 18.5 °C | 230.63 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |