Astoria, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.7 °C (low) to 13.7 °C (high). Annual precipitation averages 2042.2 Millimeters. Astoria is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4 °C | 9.3 °C | 311.91 mm |
| February | 3.9 °C | 10.3 °C | 214.12 mm |
| March | 4.6 °C | 11.7 °C | 220.22 mm |
| April | 5.9 °C | 12.1 °C | 165.61 mm |
| May | 8.4 °C | 14.7 °C | 92.2 mm |
| June | 10.5 °C | 15.5 °C | 70.61 mm |
| July | 12.7 °C | 18.5 °C | 23.62 mm |
| August | 12.7 °C | 18.2 °C | 30.23 mm |
| September | 11.5 °C | 18.2 °C | 73.91 mm |
| October | 8.7 °C | 15.4 °C | 189.23 mm |
| November | 6.1 °C | 11.9 °C | 324.87 mm |
| December | 3.8 °C | 9.1 °C | 325.63 mm |
| Annual | 7.7 °C | 13.7 °C | 2042.16 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |