Randolph, Utah has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.9 °C (low) to 12.6 °C (high). Annual precipitation averages 353.6 Millimeters. Randolph is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.5 °C | -1.7 °C | 27.18 mm |
| February | -13.6 °C | 0 °C | 25.15 mm |
| March | -8 °C | 5.8 °C | 24.89 mm |
| April | -3.9 °C | 11.4 °C | 32.77 mm |
| May | 0.3 °C | 16.7 °C | 45.72 mm |
| June | 4.1 °C | 22.8 °C | 30.23 mm |
| July | 7.4 °C | 28.1 °C | 20.83 mm |
| August | 6.3 °C | 27.1 °C | 29.21 mm |
| September | 1.6 °C | 21.9 °C | 33.78 mm |
| October | -3.6 °C | 14.3 °C | 30.99 mm |
| November | -8.6 °C | 5.9 °C | 26.67 mm |
| December | -13.8 °C | -1 °C | 26.16 mm |
| Annual | -3.9 °C | 12.6 °C | 353.58 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |