Idanha, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 38.6 °F (low) to 60.4 °F (high). Annual precipitation averages 78.3 Inches. Idanha is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.0 °F | 42.1 °F | 11.77 in. |
| February | 30.5 °F | 45.9 °F | 8.45 in. |
| March | 32.3 °F | 50.7 °F | 8.91 in. |
| April | 35.5 °F | 57.0 °F | 6.61 in. |
| May | 41.1 °F | 65.9 °F | 4.47 in. |
| June | 45.7 °F | 72.0 °F | 2.9 in. |
| July | 49.8 °F | 82.4 °F | 0.52 in. |
| August | 49.5 °F | 83.1 °F | 0.77 in. |
| September | 44.9 °F | 75.5 °F | 2.24 in. |
| October | 39.2 °F | 61.3 °F | 6.5 in. |
| November | 33.9 °F | 47.8 °F | 11.75 in. |
| December | 30.2 °F | 40.9 °F | 13.43 in. |
| Annual | 38.6 °F | 60.4 °F | 78.32 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |