Oakville, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.3 °F (low) to 60.5 °F (high). Annual precipitation averages 52 Inches. Oakville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.7 °F | 36.1 °F | 3.69 in. |
| February | 18.9 °F | 39.0 °F | 3.19 in. |
| March | 26.1 °F | 46.9 °F | 4.4 in. |
| April | 36.4 °F | 59.4 °F | 4.07 in. |
| May | 46.7 °F | 70.5 °F | 4.12 in. |
| June | 55.9 °F | 78.7 °F | 4.61 in. |
| July | 61.4 °F | 83.7 °F | 4.68 in. |
| August | 59.8 °F | 81.9 °F | 4.55 in. |
| September | 52.6 °F | 74.7 °F | 4.69 in. |
| October | 41.0 °F | 62.9 °F | 5.38 in. |
| November | 31.6 °F | 51.4 °F | 4.05 in. |
| December | 23.8 °F | 40.9 °F | 4.58 in. |
| Annual | 39.3 °F | 60.5 °F | 52.01 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |