Aberdeen, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.5 °C (low) to 14.9 °C (high). Annual precipitation averages 2195.6 Millimeters. 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 | 2.9 °C | 8.7 °C | 358.39 mm |
| February | 2.5 °C | 10.1 °C | 217.42 mm |
| March | 3.4 °C | 11.7 °C | 252.48 mm |
| April | 4.8 °C | 13.9 °C | 163.58 mm |
| May | 7.6 °C | 16.9 °C | 90.17 mm |
| June | 9.9 °C | 18.7 °C | 63.25 mm |
| July | 11.7 °C | 20.9 °C | 24.64 mm |
| August | 11.7 °C | 21.6 °C | 40.39 mm |
| September | 10 °C | 20.7 °C | 72.9 mm |
| October | 6.9 °C | 16.1 °C | 215.9 mm |
| November | 4.2 °C | 11.2 °C | 353.57 mm |
| December | 2.5 °C | 8.3 °C | 342.9 mm |
| Annual | 6.5 °C | 14.9 °C | 2195.59 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |