Rio Grande, Ohio has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43 °F (low) to 65.5 °F (high). Annual precipitation averages 43.8 Inches. Rio Grande is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.6 °F | 40.8 °F | 3.22 in. |
| February | 24.5 °F | 44.7 °F | 3.04 in. |
| March | 31.2 °F | 54.3 °F | 3.98 in. |
| April | 41.2 °F | 67.4 °F | 3.71 in. |
| May | 51.5 °F | 75.6 °F | 4.5 in. |
| June | 60.0 °F | 83.0 °F | 4.27 in. |
| July | 64.1 °F | 86.3 °F | 4.71 in. |
| August | 62.3 °F | 85.3 °F | 3.5 in. |
| September | 55.0 °F | 79.7 °F | 3.51 in. |
| October | 43.1 °F | 68.2 °F | 3.07 in. |
| November | 33.0 °F | 55.5 °F | 2.85 in. |
| December | 27.1 °F | 45.0 °F | 3.45 in. |
| Annual | 43 °F | 65.5 °F | 43.81 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |