Waitsburg, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.4 °C (low) to 17.4 °C (high). Annual precipitation averages 462.3 Millimeters. Waitsburg is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 5.2 °C | 52.07 mm |
| February | -0.9 °C | 7.8 °C | 42.42 mm |
| March | 1.8 °C | 12.6 °C | 51.56 mm |
| April | 4.3 °C | 16.5 °C | 45.72 mm |
| May | 8.1 °C | 21.4 °C | 44.2 mm |
| June | 11.2 °C | 25.3 °C | 31.5 mm |
| July | 14.4 °C | 31.3 °C | 9.91 mm |
| August | 14.2 °C | 31.1 °C | 11.18 mm |
| September | 10.1 °C | 25.7 °C | 16.76 mm |
| October | 4.9 °C | 17.6 °C | 38.86 mm |
| November | 0.8 °C | 9.5 °C | 57.4 mm |
| December | -2 °C | 4.8 °C | 60.71 mm |
| Annual | 5.4 °C | 17.4 °C | 462.29 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |