Middletown, Rhode Island has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.6 °F (low) to 58.9 °F (high). Annual precipitation averages 47.2 Inches. Middletown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.8 °F | 37.9 °F | 4.07 in. |
| February | 24.0 °F | 39.5 °F | 3.62 in. |
| March | 30.1 °F | 45.6 °F | 5.29 in. |
| April | 39.5 °F | 55.2 °F | 4.6 in. |
| May | 48.8 °F | 64.8 °F | 3.31 in. |
| June | 58.2 °F | 73.6 °F | 3.64 in. |
| July | 64.7 °F | 80.0 °F | 3.09 in. |
| August | 63.5 °F | 79.1 °F | 3.24 in. |
| September | 57.7 °F | 72.8 °F | 3.52 in. |
| October | 47.0 °F | 62.1 °F | 4.15 in. |
| November | 37.8 °F | 52.4 °F | 3.83 in. |
| December | 29.1 °F | 43.5 °F | 4.88 in. |
| Annual | 43.6 °F | 58.9 °F | 47.24 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |