Orleans, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.2 °C (low) to 11.5 °C (high). Annual precipitation averages 1156.5 Millimeters. Orleans is located in USDA Plant Hardiness Zone 4b. 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 | -15.3 °C | -4.3 °C | 78.74 mm |
| February | -14.8 °C | -2.3 °C | 66.29 mm |
| March | -9.1 °C | 2.8 °C | 74.93 mm |
| April | -1.1 °C | 10.8 °C | 88.14 mm |
| May | 5.6 °C | 18.4 °C | 103.89 mm |
| June | 10.7 °C | 23.2 °C | 119.13 mm |
| July | 13.3 °C | 25.8 °C | 121.16 mm |
| August | 12.3 °C | 24.8 °C | 114.81 mm |
| September | 8 °C | 20.7 °C | 96.27 mm |
| October | 1.9 °C | 13.1 °C | 114.05 mm |
| November | -3.8 °C | 5.6 °C | 86.61 mm |
| December | -10 °C | -0.6 °C | 92.46 mm |
| Annual | -0.2 °C | 11.5 °C | 1156.48 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |