Warren, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.5 °F (low) to 62.9 °F (high). Annual precipitation averages 44.8 Inches. Warren is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 46.6 °F | 6.73 in. |
| February | 34.8 °F | 50.6 °F | 4.89 in. |
| March | 37.8 °F | 55.6 °F | 5.15 in. |
| April | 40.8 °F | 60.9 °F | 3.47 in. |
| May | 46.5 °F | 68.0 °F | 2.56 in. |
| June | 50.7 °F | 72.7 °F | 1.76 in. |
| July | 54.8 °F | 80.6 °F | 0.43 in. |
| August | 54.8 °F | 81.8 °F | 0.65 in. |
| September | 50.3 °F | 75.9 °F | 1.57 in. |
| October | 43.7 °F | 63.6 °F | 3.55 in. |
| November | 38.5 °F | 52.5 °F | 6.4 in. |
| December | 34.6 °F | 45.8 °F | 7.59 in. |
| Annual | 43.5 °F | 62.9 °F | 44.75 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |