Orwell, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.6 °F (low) to 54 °F (high). Annual precipitation averages 56.3 Inches. Orwell 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 | 10.0 °F | 27.6 °F | 5.0 in. |
| February | 11.2 °F | 29.8 °F | 4.2 in. |
| March | 19.5 °F | 38.2 °F | 4.08 in. |
| April | 32.0 °F | 52.4 °F | 4.11 in. |
| May | 43.7 °F | 66.0 °F | 4.3 in. |
| June | 52.4 °F | 73.7 °F | 4.32 in. |
| July | 57.3 °F | 78.0 °F | 4.06 in. |
| August | 55.6 °F | 77.1 °F | 4.07 in. |
| September | 48.4 °F | 70.3 °F | 4.81 in. |
| October | 38.6 °F | 57.4 °F | 5.96 in. |
| November | 28.7 °F | 44.5 °F | 5.41 in. |
| December | 17.9 °F | 33.2 °F | 5.95 in. |
| Annual | 34.6 °F | 54 °F | 56.27 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 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 |