Wauna, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.1 °F (low) to 60.8 °F (high). Annual precipitation averages 50.4 Inches. 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 | 36.1 °F | 47.5 °F | 7.68 in. |
| February | 36.0 °F | 50.1 °F | 4.76 in. |
| March | 38.1 °F | 54.4 °F | 5.62 in. |
| April | 41.4 °F | 58.3 °F | 3.78 in. |
| May | 46.8 °F | 65.0 °F | 2.25 in. |
| June | 51.1 °F | 69.2 °F | 1.53 in. |
| July | 54.7 °F | 77.2 °F | 0.67 in. |
| August | 54.6 °F | 77.6 °F | 1.13 in. |
| September | 50.6 °F | 71.9 °F | 1.77 in. |
| October | 44.9 °F | 59.6 °F | 5.0 in. |
| November | 39.2 °F | 51.9 °F | 8.25 in. |
| December | 35.8 °F | 46.5 °F | 7.94 in. |
| Annual | 44.1 °F | 60.8 °F | 50.38 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |