Rhododendron, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 38.2 °F (low) to 57 °F (high). Annual precipitation averages 93.5 Inches. Rhododendron is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.7 °F | 40.5 °F | 12.77 in. |
| February | 29.6 °F | 44.5 °F | 9.21 in. |
| March | 32.1 °F | 50.0 °F | 10.11 in. |
| April | 35.6 °F | 54.4 °F | 8.37 in. |
| May | 40.9 °F | 61.4 °F | 6.58 in. |
| June | 45.6 °F | 66.7 °F | 4.42 in. |
| July | 50.1 °F | 75.0 °F | 0.9 in. |
| August | 49.9 °F | 76.0 °F | 1.31 in. |
| September | 45.3 °F | 70.2 °F | 3.65 in. |
| October | 38.8 °F | 58.8 °F | 8.56 in. |
| November | 33.0 °F | 46.8 °F | 12.83 in. |
| December | 28.6 °F | 39.6 °F | 14.83 in. |
| Annual | 38.2 °F | 57 °F | 93.54 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |