Arlington, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 43 °F (low) to 65.1 °F (high). Annual precipitation averages 9.4 Inches. 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 | 30.1 °F | 41.8 °F | 1.5 in. |
| February | 30.8 °F | 47.7 °F | 1.01 in. |
| March | 35.3 °F | 56.6 °F | 0.83 in. |
| April | 40.6 °F | 64.2 °F | 0.61 in. |
| May | 47.7 °F | 73.3 °F | 0.79 in. |
| June | 53.8 °F | 80.1 °F | 0.5 in. |
| July | 60.1 °F | 90.0 °F | 0.08 in. |
| August | 59.4 °F | 89.5 °F | 0.16 in. |
| September | 51.7 °F | 80.4 °F | 0.31 in. |
| October | 42.2 °F | 65.6 °F | 0.79 in. |
| November | 34.5 °F | 50.5 °F | 1.19 in. |
| December | 29.9 °F | 41.2 °F | 1.64 in. |
| Annual | 43 °F | 65.1 °F | 9.41 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |