Bly, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 30.2 °F (low) to 61.7 °F (high). Annual precipitation averages 13.8 Inches. Bly is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.3 °F | 42.0 °F | 1.76 in. |
| February | 21.8 °F | 45.5 °F | 1.21 in. |
| March | 25.3 °F | 50.9 °F | 1.62 in. |
| April | 28.1 °F | 56.7 °F | 1.48 in. |
| May | 34.2 °F | 66.1 °F | 1.18 in. |
| June | 39.5 °F | 75.4 °F | 0.76 in. |
| July | 44.7 °F | 86.0 °F | 0.57 in. |
| August | 42.6 °F | 84.9 °F | 0.38 in. |
| September | 35.4 °F | 78.3 °F | 0.41 in. |
| October | 27.7 °F | 64.9 °F | 0.88 in. |
| November | 23.7 °F | 49.7 °F | 1.49 in. |
| December | 19.1 °F | 40.5 °F | 2.06 in. |
| Annual | 30.2 °F | 61.7 °F | 13.8 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |