Gervais, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.5 °F (low) to 63.2 °F (high). Annual precipitation averages 42.6 Inches. Gervais is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.6 °F | 47.4 °F | 6.25 in. |
| February | 35.8 °F | 51.0 °F | 4.6 in. |
| March | 38.0 °F | 55.7 °F | 4.81 in. |
| April | 41.1 °F | 60.5 °F | 3.56 in. |
| May | 46.1 °F | 67.6 °F | 2.4 in. |
| June | 50.2 °F | 73.2 °F | 1.58 in. |
| July | 53.8 °F | 81.8 °F | 0.36 in. |
| August | 53.6 °F | 82.1 °F | 0.45 in. |
| September | 50.0 °F | 76.2 °F | 1.48 in. |
| October | 44.0 °F | 63.8 °F | 3.64 in. |
| November | 39.0 °F | 52.8 °F | 6.17 in. |
| December | 35.1 °F | 46.4 °F | 7.28 in. |
| Annual | 43.5 °F | 63.2 °F | 42.58 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |