Millcreek, Utah has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 18.2 °C (high). Annual precipitation averages 394.7 Millimeters. Millcreek is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °C | 3.9 °C | 34.04 mm |
| February | -3.3 °C | 6.9 °C | 33.78 mm |
| March | 1 °C | 12.7 °C | 42.16 mm |
| April | 3.6 °C | 16.6 °C | 52.83 mm |
| May | 8.5 °C | 22.2 °C | 51.05 mm |
| June | 13.1 °C | 28.4 °C | 26.16 mm |
| July | 18.2 °C | 33.8 °C | 16.26 mm |
| August | 17.2 °C | 32.8 °C | 16.51 mm |
| September | 11.7 °C | 26.9 °C | 22.61 mm |
| October | 5.1 °C | 18.8 °C | 33.27 mm |
| November | -0.8 °C | 10.5 °C | 32.26 mm |
| December | -5 °C | 4.3 °C | 33.78 mm |
| Annual | 5.3 °C | 18.2 °C | 394.71 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |