Packwood, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 40 °F (low) to 59.7 °F (high). Annual precipitation averages 58.9 Inches. Packwood is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.1 °F | 43.2 °F | 8.79 in. |
| February | 31.6 °F | 47.2 °F | 6.21 in. |
| March | 34.0 °F | 51.7 °F | 6.3 in. |
| April | 37.4 °F | 56.7 °F | 4.09 in. |
| May | 43.2 °F | 65.6 °F | 2.91 in. |
| June | 47.8 °F | 69.8 °F | 2.13 in. |
| July | 51.7 °F | 78.4 °F | 0.69 in. |
| August | 51.4 °F | 79.2 °F | 0.89 in. |
| September | 46.1 °F | 73.0 °F | 2.06 in. |
| October | 40.1 °F | 60.8 °F | 5.73 in. |
| November | 34.8 °F | 48.8 °F | 9.6 in. |
| December | 31.2 °F | 42.1 °F | 9.48 in. |
| Annual | 40 °F | 59.7 °F | 58.88 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |