Orwell, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.2 °F (low) to 59.1 °F (high). Annual precipitation averages 44.6 Inches. Orwell is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.9 °F | 33.7 °F | 3.28 in. |
| February | 18.2 °F | 36.2 °F | 2.36 in. |
| March | 25.8 °F | 45.2 °F | 3.19 in. |
| April | 36.2 °F | 58.7 °F | 3.99 in. |
| May | 47.0 °F | 69.9 °F | 4.01 in. |
| June | 56.1 °F | 78.1 °F | 4.5 in. |
| July | 60.2 °F | 82.0 °F | 4.58 in. |
| August | 58.4 °F | 80.4 °F | 3.76 in. |
| September | 52.2 °F | 74.2 °F | 4.21 in. |
| October | 41.5 °F | 62.0 °F | 3.9 in. |
| November | 32.7 °F | 49.6 °F | 3.42 in. |
| December | 24.6 °F | 38.8 °F | 3.44 in. |
| Annual | 39.2 °F | 59.1 °F | 44.64 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |