Carlton, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.5 °F (low) to 63.3 °F (high). Annual precipitation averages 46.1 Inches. Carlton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.7 °F | 47.1 °F | 7.56 in. |
| February | 35.9 °F | 50.9 °F | 5.22 in. |
| March | 37.9 °F | 55.6 °F | 5.08 in. |
| April | 40.7 °F | 60.5 °F | 3.53 in. |
| May | 46.0 °F | 67.9 °F | 2.15 in. |
| June | 50.1 °F | 73.5 °F | 1.27 in. |
| July | 53.8 °F | 82.4 °F | 0.26 in. |
| August | 53.8 °F | 82.9 °F | 0.43 in. |
| September | 50.0 °F | 76.6 °F | 1.33 in. |
| October | 44.0 °F | 63.8 °F | 3.68 in. |
| November | 38.9 °F | 52.7 °F | 7.05 in. |
| December | 35.1 °F | 46.2 °F | 8.52 in. |
| Annual | 43.5 °F | 63.3 °F | 46.08 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 |