Elmo, Utah has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 17.1 °C (high). Annual precipitation averages 221.5 Millimeters. Elmo 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.1 °C | 2.6 °C | 18.03 mm |
| February | -7.8 °C | 5.7 °C | 17.27 mm |
| March | -3.3 °C | 11.9 °C | 16 mm |
| April | -0.2 °C | 16.3 °C | 15.49 mm |
| May | 4.6 °C | 21.6 °C | 15.24 mm |
| June | 9.2 °C | 27.9 °C | 12.19 mm |
| July | 13.1 °C | 31.7 °C | 20.07 mm |
| August | 12 °C | 30.4 °C | 23.37 mm |
| September | 7.2 °C | 25.6 °C | 29.46 mm |
| October | 0.7 °C | 18.1 °C | 30.48 mm |
| November | -5.4 °C | 9.8 °C | 11.18 mm |
| December | -10.2 °C | 3 °C | 12.7 mm |
| Annual | 0.7 °C | 17.1 °C | 221.48 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |