Wilbur, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 35.2 °F (low) to 58.7 °F (high). Annual precipitation averages 12.1 Inches. Wilbur 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.1 °F | 33.4 °F | 1.43 in. |
| February | 23.8 °F | 39.0 °F | 0.97 in. |
| March | 28.6 °F | 48.9 °F | 1.29 in. |
| April | 32.7 °F | 58.2 °F | 0.97 in. |
| May | 40.1 °F | 67.9 °F | 1.23 in. |
| June | 45.2 °F | 75.0 °F | 0.93 in. |
| July | 51.4 °F | 85.4 °F | 0.56 in. |
| August | 51.1 °F | 85.1 °F | 0.31 in. |
| September | 43.6 °F | 75.4 °F | 0.33 in. |
| October | 34.4 °F | 59.6 °F | 0.98 in. |
| November | 27.1 °F | 43.1 °F | 1.44 in. |
| December | 21.7 °F | 33.2 °F | 1.66 in. |
| Annual | 35.2 °F | 58.7 °F | 12.1 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |