Idanha, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 3.7 °C (low) to 15.8 °C (high). Annual precipitation averages 1989.3 Millimeters. 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 | -1.1 °C | 5.6 °C | 298.96 mm |
| February | -0.8 °C | 7.7 °C | 214.63 mm |
| March | 0.2 °C | 10.4 °C | 226.31 mm |
| April | 1.9 °C | 13.9 °C | 167.89 mm |
| May | 5.1 °C | 18.8 °C | 113.54 mm |
| June | 7.6 °C | 22.2 °C | 73.66 mm |
| July | 9.9 °C | 28 °C | 13.21 mm |
| August | 9.7 °C | 28.4 °C | 19.56 mm |
| September | 7.2 °C | 24.2 °C | 56.9 mm |
| October | 4 °C | 16.3 °C | 165.1 mm |
| November | 1.1 °C | 8.8 °C | 298.45 mm |
| December | -1 °C | 4.9 °C | 341.12 mm |
| Annual | 3.7 °C | 15.8 °C | 1989.33 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |