Carlsborg, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.1 °C (low) to 14.4 °C (high). Annual precipitation averages 482.9 Millimeters. 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 | 2.2 °C | 7.8 °C | 62.99 mm |
| February | 2.2 °C | 8.8 °C | 50.29 mm |
| March | 3.2 °C | 11 °C | 43.69 mm |
| April | 4.8 °C | 13.6 °C | 34.54 mm |
| May | 7.3 °C | 16.7 °C | 29.46 mm |
| June | 9.5 °C | 18.9 °C | 25.15 mm |
| July | 11.1 °C | 21.6 °C | 14.73 mm |
| August | 11.1 °C | 21.9 °C | 14.48 mm |
| September | 9.1 °C | 19.7 °C | 22.86 mm |
| October | 6.6 °C | 14.8 °C | 44.45 mm |
| November | 4.1 °C | 10.2 °C | 74.17 mm |
| December | 2.1 °C | 7.7 °C | 66.04 mm |
| Annual | 6.1 °C | 14.4 °C | 482.85 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |