Middletown, Rhode Island has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 14.9 °C (high). Annual precipitation averages 1199.9 Millimeters. 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 | -5.1 °C | 3.3 °C | 103.38 mm |
| February | -4.4 °C | 4.2 °C | 91.95 mm |
| March | -1.1 °C | 7.6 °C | 134.37 mm |
| April | 4.2 °C | 12.9 °C | 116.84 mm |
| May | 9.3 °C | 18.2 °C | 84.07 mm |
| June | 14.6 °C | 23.1 °C | 92.46 mm |
| July | 18.2 °C | 26.7 °C | 78.49 mm |
| August | 17.5 °C | 26.2 °C | 82.3 mm |
| September | 14.3 °C | 22.7 °C | 89.41 mm |
| October | 8.3 °C | 16.7 °C | 105.41 mm |
| November | 3.2 °C | 11.3 °C | 97.28 mm |
| December | -1.6 °C | 6.4 °C | 123.95 mm |
| Annual | 6.5 °C | 14.9 °C | 1199.91 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |