Anacortes, 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 720.6 Millimeters. Anacortes 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 8.1 °C | 95.76 mm |
| February | 2.2 °C | 9.1 °C | 65.79 mm |
| March | 3.6 °C | 11.2 °C | 62.74 mm |
| April | 5.4 °C | 14.3 °C | 53.85 mm |
| May | 8 °C | 17.6 °C | 49.53 mm |
| June | 10.2 °C | 19.9 °C | 34.04 mm |
| July | 11.6 °C | 22.6 °C | 19.05 mm |
| August | 11.6 °C | 22.8 °C | 21.08 mm |
| September | 9.8 °C | 20.1 °C | 40.64 mm |
| October | 6.9 °C | 15.1 °C | 78.49 mm |
| November | 4.1 °C | 10.5 °C | 109.22 mm |
| December | 2.1 °C | 7.6 °C | 90.42 mm |
| Annual | 6.5 °C | 14.9 °C | 720.61 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |