Cedar Mill, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.1 °F (low) to 63.1 °F (high). Annual precipitation averages 42.1 Inches. Cedar Mill is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.9 °F | 47.1 °F | 5.98 in. |
| February | 35.9 °F | 50.9 °F | 4.47 in. |
| March | 38.4 °F | 55.8 °F | 4.61 in. |
| April | 41.3 °F | 61.3 °F | 3.32 in. |
| May | 46.9 °F | 68.3 °F | 2.55 in. |
| June | 50.9 °F | 73.2 °F | 1.7 in. |
| July | 54.9 °F | 81.1 °F | 0.42 in. |
| August | 55.0 °F | 81.7 °F | 0.54 in. |
| September | 50.8 °F | 75.8 °F | 1.52 in. |
| October | 44.5 °F | 63.6 °F | 3.73 in. |
| November | 39.2 °F | 52.5 °F | 6.13 in. |
| December | 35.3 °F | 46.0 °F | 7.15 in. |
| Annual | 44.1 °F | 63.1 °F | 42.12 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 |