Sprague, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.4 °C (low) to 15.6 °C (high). Annual precipitation averages 397.2 Millimeters. Sprague is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.6 °C | 2.2 °C | 57.4 mm |
| February | -3.4 °C | 5.4 °C | 33.27 mm |
| March | -1.1 °C | 10.6 °C | 41.15 mm |
| April | 1.3 °C | 15.1 °C | 29.97 mm |
| May | 4.9 °C | 20.4 °C | 32 mm |
| June | 8.1 °C | 24.1 °C | 29.72 mm |
| July | 11 °C | 30.2 °C | 14.99 mm |
| August | 10.8 °C | 29.8 °C | 12.19 mm |
| September | 6.6 °C | 24.6 °C | 11.68 mm |
| October | 1.7 °C | 16.1 °C | 31.75 mm |
| November | -2 °C | 7.3 °C | 49.02 mm |
| December | -4.9 °C | 1.9 °C | 54.1 mm |
| Annual | 2.4 °C | 15.6 °C | 397.24 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |