Rockport, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 41.5 °F (low) to 59.5 °F (high). Annual precipitation averages 78.8 Inches. Rockport is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.8 °F | 42.5 °F | 11.38 in. |
| February | 33.1 °F | 46.6 °F | 7.31 in. |
| March | 35.3 °F | 51.8 °F | 8.35 in. |
| April | 39.1 °F | 59.0 °F | 5.49 in. |
| May | 44.4 °F | 66.7 °F | 3.89 in. |
| June | 48.9 °F | 70.4 °F | 3.3 in. |
| July | 51.9 °F | 77.5 °F | 1.6 in. |
| August | 52.1 °F | 78.7 °F | 1.7 in. |
| September | 48.3 °F | 71.6 °F | 3.6 in. |
| October | 42.1 °F | 59.0 °F | 8.15 in. |
| November | 36.6 °F | 48.1 °F | 12.96 in. |
| December | 32.8 °F | 41.8 °F | 11.09 in. |
| Annual | 41.5 °F | 59.5 °F | 78.82 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |