North Plains, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.3 °C (low) to 17.3 °C (high). Annual precipitation averages 1039.4 Millimeters. North Plains is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 8.3 °C | 159.51 mm |
| February | 1.7 °C | 10.4 °C | 113.79 mm |
| March | 3.2 °C | 13.2 °C | 108.97 mm |
| April | 4.8 °C | 16.1 °C | 76.71 mm |
| May | 7.9 °C | 20.1 °C | 55.12 mm |
| June | 10.3 °C | 22.9 °C | 36.32 mm |
| July | 12.4 °C | 27.3 °C | 9.14 mm |
| August | 12.3 °C | 27.7 °C | 12.45 mm |
| September | 9.9 °C | 24.5 °C | 33.27 mm |
| October | 6.3 °C | 17.7 °C | 85.85 mm |
| November | 3.6 °C | 11.4 °C | 155.7 mm |
| December | 1.5 °C | 7.8 °C | 192.53 mm |
| Annual | 6.3 °C | 17.3 °C | 1039.36 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |