Milwaukie, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 45.6 °F (low) to 63.4 °F (high). Annual precipitation averages 43.2 Inches. Milwaukie is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.6 °F | 47.2 °F | 6.54 in. |
| February | 37.2 °F | 51.0 °F | 4.36 in. |
| March | 39.5 °F | 56.0 °F | 4.68 in. |
| April | 43.1 °F | 61.4 °F | 3.64 in. |
| May | 48.4 °F | 68.6 °F | 2.49 in. |
| June | 52.7 °F | 73.5 °F | 1.7 in. |
| July | 56.7 °F | 81.1 °F | 0.45 in. |
| August | 56.8 °F | 81.8 °F | 0.6 in. |
| September | 52.7 °F | 76.0 °F | 1.57 in. |
| October | 46.3 °F | 64.3 °F | 3.84 in. |
| November | 40.8 °F | 53.1 °F | 6.31 in. |
| December | 36.4 °F | 46.6 °F | 7.03 in. |
| Annual | 45.6 °F | 63.4 °F | 43.21 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°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 |