Sprague River, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 29.8 °F (low) to 61.5 °F (high). Annual precipitation averages 13.9 Inches. Sprague River is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.7 °F | 41.0 °F | 2.0 in. |
| February | 21.5 °F | 45.1 °F | 1.59 in. |
| March | 25.1 °F | 50.4 °F | 1.55 in. |
| April | 27.6 °F | 57.0 °F | 1.06 in. |
| May | 33.6 °F | 66.7 °F | 1.22 in. |
| June | 38.4 °F | 75.5 °F | 0.68 in. |
| July | 44.0 °F | 86.1 °F | 0.29 in. |
| August | 42.0 °F | 85.0 °F | 0.37 in. |
| September | 34.9 °F | 78.2 °F | 0.39 in. |
| October | 27.9 °F | 64.6 °F | 0.95 in. |
| November | 23.7 °F | 48.6 °F | 1.41 in. |
| December | 19.0 °F | 39.5 °F | 2.39 in. |
| Annual | 29.8 °F | 61.5 °F | 13.9 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |