Eureka, Utah has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.7 °C (low) to 15.1 °C (high). Annual precipitation averages 449.3 Millimeters. Eureka is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 2.6 °C | 46.23 mm |
| February | -5.9 °C | 4.3 °C | 46.48 mm |
| March | -2.8 °C | 9.1 °C | 47.5 mm |
| April | 0.1 °C | 12.8 °C | 43.43 mm |
| May | 3.6 °C | 18.6 °C | 47.24 mm |
| June | 8.3 °C | 25.3 °C | 29.21 mm |
| July | 13.5 °C | 29.6 °C | 21.34 mm |
| August | 12.4 °C | 29 °C | 24.38 mm |
| September | 8 °C | 23.7 °C | 27.43 mm |
| October | 1.7 °C | 15.9 °C | 40.13 mm |
| November | -3.3 °C | 7.9 °C | 34.8 mm |
| December | -7.9 °C | 2.6 °C | 41.15 mm |
| Annual | 1.7 °C | 15.1 °C | 449.32 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |