Arlington, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.9 °C (low) to 11.6 °C (high). Annual precipitation averages 520 Millimeters. Arlington is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Aug. 11 - Aug. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.6 °C | 0.2 °C | 29.21 mm |
| February | -9.8 °C | 1.1 °C | 28.45 mm |
| March | -6.6 °C | 5.3 °C | 41.66 mm |
| April | -3.4 °C | 8.9 °C | 62.99 mm |
| May | 1.1 °C | 14.8 °C | 66.55 mm |
| June | 5.6 °C | 21.2 °C | 44.2 mm |
| July | 8.4 °C | 25.9 °C | 37.34 mm |
| August | 7.5 °C | 24.8 °C | 32 mm |
| September | 3.6 °C | 19.9 °C | 34.8 mm |
| October | -1.6 °C | 12.2 °C | 53.09 mm |
| November | -6.6 °C | 4.9 °C | 45.72 mm |
| December | -9.9 °C | -0.1 °C | 43.94 mm |
| Annual | -1.9 °C | 11.6 °C | 519.95 mm |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |