Molalla, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44 °F (low) to 63 °F (high). Annual precipitation averages 44.8 Inches. Molalla 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.6 °F | 47.4 °F | 6.08 in. |
| February | 36.0 °F | 51.0 °F | 4.49 in. |
| March | 38.3 °F | 55.6 °F | 5.16 in. |
| April | 41.4 °F | 60.4 °F | 4.26 in. |
| May | 46.5 °F | 67.2 °F | 2.92 in. |
| June | 50.8 °F | 72.6 °F | 2.03 in. |
| July | 54.7 °F | 81.0 °F | 0.44 in. |
| August | 54.7 °F | 81.9 °F | 0.51 in. |
| September | 51.0 °F | 76.1 °F | 1.65 in. |
| October | 44.7 °F | 63.8 °F | 4.13 in. |
| November | 39.3 °F | 52.6 °F | 6.29 in. |
| December | 35.1 °F | 46.5 °F | 6.8 in. |
| Annual | 44 °F | 63 °F | 44.76 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |