Carlsborg, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43 °F (low) to 57.9 °F (high). Annual precipitation averages 19 Inches. Carlsborg is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.0 °F | 46.1 °F | 2.48 in. |
| February | 35.9 °F | 47.9 °F | 1.98 in. |
| March | 37.7 °F | 51.8 °F | 1.72 in. |
| April | 40.7 °F | 56.5 °F | 1.36 in. |
| May | 45.2 °F | 62.0 °F | 1.16 in. |
| June | 49.1 °F | 66.1 °F | 0.99 in. |
| July | 51.9 °F | 70.9 °F | 0.58 in. |
| August | 51.9 °F | 71.5 °F | 0.57 in. |
| September | 48.4 °F | 67.5 °F | 0.9 in. |
| October | 43.8 °F | 58.6 °F | 1.75 in. |
| November | 39.3 °F | 50.4 °F | 2.92 in. |
| December | 35.8 °F | 45.8 °F | 2.6 in. |
| Annual | 43 °F | 57.9 °F | 19.01 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |