Astoria, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 45.9 °F (low) to 56.8 °F (high). Annual precipitation averages 80.4 Inches. 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 | 39.2 °F | 48.7 °F | 12.28 in. |
| February | 39.0 °F | 50.6 °F | 8.43 in. |
| March | 40.3 °F | 53.1 °F | 8.67 in. |
| April | 42.6 °F | 53.7 °F | 6.52 in. |
| May | 47.2 °F | 58.4 °F | 3.63 in. |
| June | 50.9 °F | 59.9 °F | 2.78 in. |
| July | 54.8 °F | 65.3 °F | 0.93 in. |
| August | 54.8 °F | 64.8 °F | 1.19 in. |
| September | 52.7 °F | 64.8 °F | 2.91 in. |
| October | 47.6 °F | 59.8 °F | 7.45 in. |
| November | 42.9 °F | 53.5 °F | 12.79 in. |
| December | 38.8 °F | 48.4 °F | 12.82 in. |
| Annual | 45.9 °F | 56.8 °F | 80.4 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |