Sprague River, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -1.2 °C (low) to 16.4 °C (high). Annual precipitation averages 353.1 Millimeters. 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 | -6.8 °C | 5 °C | 50.8 mm |
| February | -5.8 °C | 7.3 °C | 40.39 mm |
| March | -3.8 °C | 10.2 °C | 39.37 mm |
| April | -2.4 °C | 13.9 °C | 26.92 mm |
| May | 0.9 °C | 19.3 °C | 30.99 mm |
| June | 3.6 °C | 24.2 °C | 17.27 mm |
| July | 6.7 °C | 30.1 °C | 7.37 mm |
| August | 5.6 °C | 29.4 °C | 9.4 mm |
| September | 1.6 °C | 25.7 °C | 9.91 mm |
| October | -2.3 °C | 18.1 °C | 24.13 mm |
| November | -4.6 °C | 9.2 °C | 35.81 mm |
| December | -7.2 °C | 4.2 °C | 60.71 mm |
| Annual | -1.2 °C | 16.4 °C | 353.07 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |