Joseph, Oregon has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.1 °C (low) to 13.7 °C (high). Annual precipitation averages 425.2 Millimeters. 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 | -8.6 °C | 1.2 °C | 29.97 mm |
| February | -7.2 °C | 4.6 °C | 24.64 mm |
| March | -4.3 °C | 8.8 °C | 41.91 mm |
| April | -1.9 °C | 12.2 °C | 51.56 mm |
| May | 2 °C | 17.1 °C | 62.99 mm |
| June | 4.7 °C | 21 °C | 49.53 mm |
| July | 7.3 °C | 27.3 °C | 20.32 mm |
| August | 6.9 °C | 27.6 °C | 20.57 mm |
| September | 3.4 °C | 22.4 °C | 24.64 mm |
| October | -1.2 °C | 14.8 °C | 31.24 mm |
| November | -5.5 °C | 6.6 °C | 36.32 mm |
| December | -8.8 °C | 1.1 °C | 31.5 mm |
| Annual | -1.1 °C | 13.7 °C | 425.19 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |