Clarendon, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.2 °F (low) to 55.1 °F (high). Annual precipitation averages 43.2 Inches. Clarendon 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.5 °F | 30.4 °F | 2.86 in. |
| February | 11.6 °F | 33.4 °F | 2.38 in. |
| March | 20.2 °F | 41.0 °F | 3.06 in. |
| April | 31.7 °F | 53.0 °F | 3.4 in. |
| May | 43.1 °F | 65.5 °F | 3.85 in. |
| June | 52.1 °F | 73.7 °F | 4.5 in. |
| July | 57.0 °F | 78.2 °F | 4.66 in. |
| August | 55.1 °F | 76.6 °F | 4.12 in. |
| September | 46.9 °F | 70.2 °F | 3.64 in. |
| October | 37.2 °F | 57.1 °F | 4.26 in. |
| November | 27.2 °F | 46.3 °F | 3.04 in. |
| December | 18.1 °F | 35.5 °F | 3.45 in. |
| Annual | 34.2 °F | 55.1 °F | 43.22 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |