Arlington, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 6.1 °C (low) to 18.4 °C (high). Annual precipitation averages 239 Millimeters. Arlington is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.1 °C | 5.4 °C | 38.1 mm |
| February | -0.7 °C | 8.7 °C | 25.65 mm |
| March | 1.8 °C | 13.7 °C | 21.08 mm |
| April | 4.8 °C | 17.9 °C | 15.49 mm |
| May | 8.7 °C | 22.9 °C | 20.07 mm |
| June | 12.1 °C | 26.7 °C | 12.7 mm |
| July | 15.6 °C | 32.2 °C | 2.03 mm |
| August | 15.2 °C | 31.9 °C | 4.06 mm |
| September | 10.9 °C | 26.9 °C | 7.87 mm |
| October | 5.7 °C | 18.7 °C | 20.07 mm |
| November | 1.4 °C | 10.3 °C | 30.23 mm |
| December | -1.2 °C | 5.1 °C | 41.66 mm |
| Annual | 6.1 °C | 18.4 °C | 239.01 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |