Randolph, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.8 °F (low) to 55.7 °F (high). Annual precipitation averages 44.1 Inches. Randolph is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.9 °F | 28.5 °F | 3.07 in. |
| February | 8.7 °F | 31.7 °F | 2.7 in. |
| March | 18.0 °F | 40.3 °F | 3.43 in. |
| April | 30.1 °F | 54.3 °F | 3.47 in. |
| May | 41.8 °F | 68.0 °F | 3.44 in. |
| June | 50.9 °F | 76.1 °F | 4.58 in. |
| July | 56.1 °F | 80.9 °F | 4.53 in. |
| August | 54.5 °F | 78.8 °F | 4.1 in. |
| September | 47.2 °F | 71.9 °F | 3.55 in. |
| October | 36.2 °F | 58.4 °F | 4.15 in. |
| November | 26.6 °F | 45.4 °F | 3.26 in. |
| December | 16.1 °F | 33.7 °F | 3.84 in. |
| Annual | 32.8 °F | 55.7 °F | 44.12 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |