Cranston, 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 15.7 °C (high). Annual precipitation averages 1311.7 Millimeters. Cranston 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 | -5.6 °C | 3.3 °C | 107.19 mm |
| February | -4.9 °C | 4.3 °C | 95.76 mm |
| March | -1 °C | 8.1 °C | 130.3 mm |
| April | 4.6 °C | 14.2 °C | 125.48 mm |
| May | 9.9 °C | 20.1 °C | 89.41 mm |
| June | 15.3 °C | 24.7 °C | 111.25 mm |
| July | 18.8 °C | 28.1 °C | 86.36 mm |
| August | 18 °C | 27.3 °C | 99.57 mm |
| September | 14.2 °C | 23.5 °C | 108.2 mm |
| October | 7.9 °C | 17.3 °C | 119.63 mm |
| November | 2.4 °C | 11.6 °C | 112.52 mm |
| December | -2.2 °C | 6.2 °C | 125.98 mm |
| Annual | 6.5 °C | 15.7 °C | 1311.65 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |