Sprague, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36.3 °F (low) to 60.2 °F (high). Annual precipitation averages 15.6 Inches. 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 | 23.8 °F | 36.0 °F | 2.26 in. |
| February | 25.9 °F | 41.8 °F | 1.31 in. |
| March | 30.0 °F | 51.0 °F | 1.62 in. |
| April | 34.3 °F | 59.2 °F | 1.18 in. |
| May | 40.9 °F | 68.7 °F | 1.26 in. |
| June | 46.6 °F | 75.4 °F | 1.17 in. |
| July | 51.8 °F | 86.4 °F | 0.59 in. |
| August | 51.5 °F | 85.6 °F | 0.48 in. |
| September | 43.9 °F | 76.2 °F | 0.46 in. |
| October | 35.1 °F | 61.0 °F | 1.25 in. |
| November | 28.4 °F | 45.2 °F | 1.93 in. |
| December | 23.1 °F | 35.4 °F | 2.13 in. |
| Annual | 36.3 °F | 60.2 °F | 15.64 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |