Melrose, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.4 °F (low) to 66.4 °F (high). Annual precipitation averages 40.7 Inches. Melrose is located in USDA Plant Hardiness Zone 9a. 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 | 35.8 °F | 49.7 °F | 6.74 in. |
| February | 36.1 °F | 53.8 °F | 4.97 in. |
| March | 37.7 °F | 58.5 °F | 5.22 in. |
| April | 40.5 °F | 63.1 °F | 3.44 in. |
| May | 45.4 °F | 70.3 °F | 2.02 in. |
| June | 50.0 °F | 77.1 °F | 1.12 in. |
| July | 54.1 °F | 85.8 °F | 0.31 in. |
| August | 53.5 °F | 86.9 °F | 0.43 in. |
| September | 49.0 °F | 80.7 °F | 0.8 in. |
| October | 43.4 °F | 67.3 °F | 2.67 in. |
| November | 39.8 °F | 54.9 °F | 5.7 in. |
| December | 35.8 °F | 48.1 °F | 7.32 in. |
| Annual | 43.4 °F | 66.4 °F | 40.74 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |