Carlton, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.4 °C (low) to 17.4 °C (high). Annual precipitation averages 1170.4 Millimeters. 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 | 2.1 °C | 8.4 °C | 192.02 mm |
| February | 2.2 °C | 10.5 °C | 132.59 mm |
| March | 3.3 °C | 13.1 °C | 129.03 mm |
| April | 4.8 °C | 15.8 °C | 89.66 mm |
| May | 7.8 °C | 19.9 °C | 54.61 mm |
| June | 10.1 °C | 23.1 °C | 32.26 mm |
| July | 12.1 °C | 28 °C | 6.6 mm |
| August | 12.1 °C | 28.3 °C | 10.92 mm |
| September | 10 °C | 24.8 °C | 33.78 mm |
| October | 6.7 °C | 17.7 °C | 93.47 mm |
| November | 3.8 °C | 11.5 °C | 179.07 mm |
| December | 1.7 °C | 7.9 °C | 216.41 mm |
| Annual | 6.4 °C | 17.4 °C | 1170.42 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |