Joseph, Oregon has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.1 °F (low) to 56.7 °F (high). Annual precipitation averages 16.7 Inches. Joseph is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Aug. 1 - Aug. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.5 °F | 34.1 °F | 1.18 in. |
| February | 19.1 °F | 40.3 °F | 0.97 in. |
| March | 24.3 °F | 47.8 °F | 1.65 in. |
| April | 28.6 °F | 54.0 °F | 2.03 in. |
| May | 35.6 °F | 62.7 °F | 2.48 in. |
| June | 40.5 °F | 69.8 °F | 1.95 in. |
| July | 45.2 °F | 81.1 °F | 0.8 in. |
| August | 44.5 °F | 81.6 °F | 0.81 in. |
| September | 38.1 °F | 72.4 °F | 0.97 in. |
| October | 29.9 °F | 58.6 °F | 1.23 in. |
| November | 22.1 °F | 43.9 °F | 1.43 in. |
| December | 16.2 °F | 34.0 °F | 1.24 in. |
| Annual | 30.1 °F | 56.7 °F | 16.74 in. |
| Average First Frost Date | Aug. 1 - Aug. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |