Roosevelt, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 43.1 °F (low) to 65.2 °F (high). Annual precipitation averages 9.2 Inches. 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 | 30.2 °F | 41.9 °F | 1.48 in. |
| February | 30.8 °F | 47.8 °F | 1.02 in. |
| March | 35.4 °F | 56.8 °F | 0.82 in. |
| April | 40.7 °F | 64.3 °F | 0.56 in. |
| May | 47.9 °F | 73.4 °F | 0.77 in. |
| June | 54.0 °F | 80.1 °F | 0.46 in. |
| July | 60.2 °F | 90.0 °F | 0.08 in. |
| August | 59.6 °F | 89.6 °F | 0.15 in. |
| September | 51.8 °F | 80.5 °F | 0.31 in. |
| October | 42.4 °F | 65.7 °F | 0.77 in. |
| November | 34.6 °F | 50.7 °F | 1.17 in. |
| December | 30.1 °F | 41.4 °F | 1.61 in. |
| Annual | 43.1 °F | 65.2 °F | 9.2 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |