Clinton, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 44.3 °F (low) to 60.9 °F (high). Annual precipitation averages 49.5 Inches. Clinton is located in USDA Plant Hardiness Zone 7a. 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 | 24.0 °F | 39.0 °F | 3.72 in. |
| February | 24.8 °F | 40.5 °F | 3.32 in. |
| March | 30.7 °F | 46.9 °F | 4.61 in. |
| April | 39.7 °F | 58.5 °F | 4.6 in. |
| May | 48.6 °F | 67.9 °F | 3.77 in. |
| June | 58.5 °F | 76.4 °F | 4.3 in. |
| July | 65.3 °F | 82.2 °F | 3.44 in. |
| August | 64.9 °F | 80.6 °F | 4.17 in. |
| September | 58.0 °F | 75.5 °F | 4.35 in. |
| October | 48.1 °F | 64.7 °F | 4.69 in. |
| November | 38.7 °F | 53.9 °F | 3.98 in. |
| December | 30.1 °F | 44.4 °F | 4.54 in. |
| Annual | 44.3 °F | 60.9 °F | 49.49 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |