Riverview, Delaware has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.2 °F (low) to 65.6 °F (high). Annual precipitation averages 46.7 Inches. Riverview is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.5 °F | 43.5 °F | 3.41 in. |
| February | 26.8 °F | 45.8 °F | 3.03 in. |
| March | 33.8 °F | 53.3 °F | 4.19 in. |
| April | 43.8 °F | 64.5 °F | 3.57 in. |
| May | 53.4 °F | 73.4 °F | 3.89 in. |
| June | 62.7 °F | 82.2 °F | 4.14 in. |
| July | 67.9 °F | 86.8 °F | 4.21 in. |
| August | 65.9 °F | 84.8 °F | 4.7 in. |
| September | 59.4 °F | 78.9 °F | 4.44 in. |
| October | 47.6 °F | 68.0 °F | 3.96 in. |
| November | 37.1 °F | 57.5 °F | 3.22 in. |
| December | 30.4 °F | 48.1 °F | 3.95 in. |
| Annual | 46.2 °F | 65.6 °F | 46.71 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |