Altamont, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 32.1 °F (low) to 60.9 °F (high). Annual precipitation averages 13.4 Inches. Altamont is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.5 °F | 40.9 °F | 1.97 in. |
| February | 23.7 °F | 45.1 °F | 1.41 in. |
| March | 26.7 °F | 50.5 °F | 1.32 in. |
| April | 29.6 °F | 56.5 °F | 1.1 in. |
| May | 36.1 °F | 65.9 °F | 1.14 in. |
| June | 41.2 °F | 74.3 °F | 0.66 in. |
| July | 47.2 °F | 84.6 °F | 0.25 in. |
| August | 45.3 °F | 83.7 °F | 0.35 in. |
| September | 38.4 °F | 76.8 °F | 0.38 in. |
| October | 30.3 °F | 63.7 °F | 0.87 in. |
| November | 25.1 °F | 48.6 °F | 1.57 in. |
| December | 20.6 °F | 39.6 °F | 2.38 in. |
| Annual | 32.1 °F | 60.9 °F | 13.4 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |