Odessa, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3 °C (low) to 16.3 °C (high). Annual precipitation averages 273.8 Millimeters. Odessa is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.5 °C | 2.3 °C | 37.34 mm |
| February | -3.2 °C | 5.9 °C | 24.64 mm |
| March | -0.7 °C | 11.4 °C | 28.45 mm |
| April | 1.8 °C | 16.3 °C | 21.34 mm |
| May | 5.8 °C | 21.5 °C | 24.38 mm |
| June | 9 °C | 25.3 °C | 20.07 mm |
| July | 12.2 °C | 30.8 °C | 8.38 mm |
| August | 11.8 °C | 30.6 °C | 6.6 mm |
| September | 7.6 °C | 25.3 °C | 8.64 mm |
| October | 2.4 °C | 16.9 °C | 20.83 mm |
| November | -1.8 °C | 7.7 °C | 35.05 mm |
| December | -4.8 °C | 2 °C | 38.1 mm |
| Annual | 3 °C | 16.3 °C | 273.82 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | BSk - Cold Semi-Arid Climate |