Selma, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 40.1 °F (low) to 69 °F (high). Annual precipitation averages 50.2 Inches. Selma is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.4 °F | 49.0 °F | 9.36 in. |
| February | 33.1 °F | 54.6 °F | 6.73 in. |
| March | 34.5 °F | 59.4 °F | 6.79 in. |
| April | 37.3 °F | 65.1 °F | 3.55 in. |
| May | 42.4 °F | 74.3 °F | 2.05 in. |
| June | 47.2 °F | 82.2 °F | 0.81 in. |
| July | 52.1 °F | 92.5 °F | 0.46 in. |
| August | 50.1 °F | 92.2 °F | 0.22 in. |
| September | 45.0 °F | 85.8 °F | 0.63 in. |
| October | 38.6 °F | 71.3 °F | 2.81 in. |
| November | 36.0 °F | 54.9 °F | 7.23 in. |
| December | 32.8 °F | 47.1 °F | 9.54 in. |
| Annual | 40.1 °F | 69 °F | 50.18 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 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 |