Clarendon, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12.8 °C (high). Annual precipitation averages 1097.8 Millimeters. 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 | -11.9 °C | -0.9 °C | 72.64 mm |
| February | -11.3 °C | 0.8 °C | 60.45 mm |
| March | -6.6 °C | 5 °C | 77.72 mm |
| April | -0.2 °C | 11.7 °C | 86.36 mm |
| May | 6.2 °C | 18.6 °C | 97.79 mm |
| June | 11.2 °C | 23.2 °C | 114.3 mm |
| July | 13.9 °C | 25.7 °C | 118.36 mm |
| August | 12.8 °C | 24.8 °C | 104.65 mm |
| September | 8.3 °C | 21.2 °C | 92.46 mm |
| October | 2.9 °C | 13.9 °C | 108.2 mm |
| November | -2.7 °C | 7.9 °C | 77.22 mm |
| December | -7.7 °C | 1.9 °C | 87.63 mm |
| Annual | 1.2 °C | 12.8 °C | 1097.78 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |