Roosevelt, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 6.2 °C (low) to 18.4 °C (high). Annual precipitation averages 233.7 Millimeters. Roosevelt is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1 °C | 5.5 °C | 37.59 mm |
| February | -0.7 °C | 8.8 °C | 25.91 mm |
| March | 1.9 °C | 13.8 °C | 20.83 mm |
| April | 4.8 °C | 17.9 °C | 14.22 mm |
| May | 8.8 °C | 23 °C | 19.56 mm |
| June | 12.2 °C | 26.7 °C | 11.68 mm |
| July | 15.7 °C | 32.2 °C | 2.03 mm |
| August | 15.3 °C | 32 °C | 3.81 mm |
| September | 11 °C | 26.9 °C | 7.87 mm |
| October | 5.8 °C | 18.7 °C | 19.56 mm |
| November | 1.4 °C | 10.4 °C | 29.72 mm |
| December | -1.1 °C | 5.2 °C | 40.89 mm |
| Annual | 6.2 °C | 18.4 °C | 233.67 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |