Wilbur, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.7 °C (low) to 14.8 °C (high). Annual precipitation averages 307.3 Millimeters. 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 | -5.5 °C | 0.8 °C | 36.32 mm |
| February | -4.6 °C | 3.9 °C | 24.64 mm |
| March | -1.9 °C | 9.4 °C | 32.77 mm |
| April | 0.4 °C | 14.6 °C | 24.64 mm |
| May | 4.5 °C | 19.9 °C | 31.24 mm |
| June | 7.3 °C | 23.9 °C | 23.62 mm |
| July | 10.8 °C | 29.7 °C | 14.22 mm |
| August | 10.6 °C | 29.5 °C | 7.87 mm |
| September | 6.4 °C | 24.1 °C | 8.38 mm |
| October | 1.3 °C | 15.3 °C | 24.89 mm |
| November | -2.7 °C | 6.2 °C | 36.58 mm |
| December | -5.7 °C | 0.7 °C | 42.16 mm |
| Annual | 1.7 °C | 14.8 °C | 307.33 mm |
| 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 : -20.6°C to -17.8°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 |