Aberdeen, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.7 °F (low) to 58.8 °F (high). Annual precipitation averages 86.4 Inches. Aberdeen is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.2 °F | 47.7 °F | 14.11 in. |
| February | 36.5 °F | 50.2 °F | 8.56 in. |
| March | 38.2 °F | 53.0 °F | 9.94 in. |
| April | 40.7 °F | 57.1 °F | 6.44 in. |
| May | 45.7 °F | 62.4 °F | 3.55 in. |
| June | 49.8 °F | 65.7 °F | 2.49 in. |
| July | 53.0 °F | 69.7 °F | 0.97 in. |
| August | 53.0 °F | 70.9 °F | 1.59 in. |
| September | 50.0 °F | 69.3 °F | 2.87 in. |
| October | 44.5 °F | 60.9 °F | 8.5 in. |
| November | 39.5 °F | 52.1 °F | 13.92 in. |
| December | 36.5 °F | 47.0 °F | 13.5 in. |
| Annual | 43.7 °F | 58.8 °F | 86.44 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |