Warren, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.4 °C (low) to 17.2 °C (high). Annual precipitation averages 1136.7 Millimeters. 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 | 1.6 °C | 8.1 °C | 170.94 mm |
| February | 1.6 °C | 10.3 °C | 124.21 mm |
| March | 3.2 °C | 13.1 °C | 130.81 mm |
| April | 4.9 °C | 16.1 °C | 88.14 mm |
| May | 8.1 °C | 20 °C | 65.02 mm |
| June | 10.4 °C | 22.6 °C | 44.7 mm |
| July | 12.7 °C | 27 °C | 10.92 mm |
| August | 12.7 °C | 27.7 °C | 16.51 mm |
| September | 10.2 °C | 24.4 °C | 39.88 mm |
| October | 6.5 °C | 17.6 °C | 90.17 mm |
| November | 3.6 °C | 11.4 °C | 162.56 mm |
| December | 1.4 °C | 7.7 °C | 192.79 mm |
| Annual | 6.4 °C | 17.2 °C | 1136.65 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |