Bellfountain, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42 °F (low) to 63.2 °F (high). Annual precipitation averages 46.9 Inches. Bellfountain 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 47.2 °F | 7.26 in. |
| February | 35.0 °F | 51.1 °F | 5.54 in. |
| March | 36.9 °F | 55.8 °F | 6.32 in. |
| April | 39.5 °F | 60.3 °F | 3.48 in. |
| May | 44.1 °F | 66.9 °F | 2.15 in. |
| June | 48.2 °F | 73.3 °F | 1.24 in. |
| July | 51.7 °F | 81.7 °F | 0.28 in. |
| August | 51.6 °F | 82.6 °F | 0.39 in. |
| September | 48.0 °F | 76.9 °F | 1.3 in. |
| October | 42.3 °F | 64.1 °F | 3.49 in. |
| November | 37.9 °F | 52.8 °F | 6.46 in. |
| December | 34.4 °F | 46.2 °F | 8.94 in. |
| Annual | 42 °F | 63.2 °F | 46.85 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |