Randolph, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.7 °C (high). Annual precipitation averages 844.8 Millimeters. Randolph is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.3 °C | -4.8 °C | 22.86 mm |
| February | -12.4 °C | -2.1 °C | 23.62 mm |
| March | -5.6 °C | 4.7 °C | 44.96 mm |
| April | 1.6 °C | 13.2 °C | 72.39 mm |
| May | 8.6 °C | 20.2 °C | 110.74 mm |
| June | 14.4 °C | 25.4 °C | 131.06 mm |
| July | 16.6 °C | 27.6 °C | 101.85 mm |
| August | 15.2 °C | 26.6 °C | 116.08 mm |
| September | 10.5 °C | 22.6 °C | 87.38 mm |
| October | 3.3 °C | 14.8 °C | 60.96 mm |
| November | -3.5 °C | 5.7 °C | 41.66 mm |
| December | -10.4 °C | -1.7 °C | 31.24 mm |
| Annual | 2 °C | 12.7 °C | 844.8 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |