Nyssa, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 39.1 °F (low) to 64.9 °F (high). Annual precipitation averages 10.1 Inches. Nyssa is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.1 °F | 37.1 °F | 1.33 in. |
| February | 26.4 °F | 45.8 °F | 0.81 in. |
| March | 32.1 °F | 57.0 °F | 0.93 in. |
| April | 37.3 °F | 64.6 °F | 0.86 in. |
| May | 46.0 °F | 73.8 °F | 1.24 in. |
| June | 52.6 °F | 82.0 °F | 0.81 in. |
| July | 59.3 °F | 92.6 °F | 0.24 in. |
| August | 56.8 °F | 91.4 °F | 0.13 in. |
| September | 47.6 °F | 81.2 °F | 0.57 in. |
| October | 36.9 °F | 66.0 °F | 0.77 in. |
| November | 28.4 °F | 49.1 °F | 1.01 in. |
| December | 23.1 °F | 38.1 °F | 1.43 in. |
| Annual | 39.1 °F | 64.9 °F | 10.13 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |