Bay Center, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.5 °F (low) to 57 °F (high). Annual precipitation averages 77.4 Inches. Bay Center is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.7 °F | 48.7 °F | 12.08 in. |
| February | 39.9 °F | 50.5 °F | 7.28 in. |
| March | 41.2 °F | 52.6 °F | 8.76 in. |
| April | 43.6 °F | 54.8 °F | 6.01 in. |
| May | 47.8 °F | 58.7 °F | 4.03 in. |
| June | 51.3 °F | 60.5 °F | 2.48 in. |
| July | 54.2 °F | 65.4 °F | 1.24 in. |
| August | 54.5 °F | 66.1 °F | 1.59 in. |
| September | 52.8 °F | 65.5 °F | 2.76 in. |
| October | 48.1 °F | 59.8 °F | 7.13 in. |
| November | 43.3 °F | 53.1 °F | 12.04 in. |
| December | 40.0 °F | 48.3 °F | 12.01 in. |
| Annual | 46.5 °F | 57 °F | 77.41 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 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 |