Wauna, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.7 °C (low) to 16 °C (high). Annual precipitation averages 1279.7 Millimeters. Wauna is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 8.6 °C | 195.07 mm |
| February | 2.2 °C | 10.1 °C | 120.9 mm |
| March | 3.4 °C | 12.4 °C | 142.75 mm |
| April | 5.2 °C | 14.6 °C | 96.01 mm |
| May | 8.2 °C | 18.3 °C | 57.15 mm |
| June | 10.6 °C | 20.7 °C | 38.86 mm |
| July | 12.6 °C | 25.1 °C | 17.02 mm |
| August | 12.6 °C | 25.3 °C | 28.7 mm |
| September | 10.3 °C | 22.2 °C | 44.96 mm |
| October | 7.2 °C | 15.3 °C | 127 mm |
| November | 4 °C | 11.1 °C | 209.55 mm |
| December | 2.1 °C | 8.1 °C | 201.68 mm |
| Annual | 6.7 °C | 16 °C | 1279.65 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |