Rockport, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.5 °F (low) to 67.4 °F (high). Annual precipitation averages 49.1 Inches. Rockport is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.3 °F | 42.1 °F | 3.63 in. |
| February | 27.4 °F | 46.6 °F | 3.55 in. |
| March | 35.5 °F | 56.4 °F | 4.48 in. |
| April | 45.6 °F | 68.3 °F | 4.99 in. |
| May | 56.0 °F | 77.5 °F | 5.25 in. |
| June | 64.5 °F | 85.5 °F | 4.47 in. |
| July | 67.9 °F | 88.3 °F | 4.28 in. |
| August | 65.6 °F | 87.8 °F | 3.08 in. |
| September | 58.2 °F | 82.3 °F | 3.6 in. |
| October | 46.8 °F | 70.9 °F | 3.63 in. |
| November | 36.2 °F | 56.7 °F | 3.89 in. |
| December | 29.2 °F | 46.2 °F | 4.28 in. |
| Annual | 46.5 °F | 67.4 °F | 49.13 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |