Arlington, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.1 °F (low) to 54.6 °F (high). Annual precipitation averages 26.5 Inches. Arlington is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.6 °F | 22.8 °F | 0.63 in. |
| February | 9.1 °F | 28.1 °F | 0.8 in. |
| March | 20.7 °F | 39.7 °F | 1.18 in. |
| April | 32.9 °F | 55.5 °F | 2.47 in. |
| May | 45.8 °F | 68.0 °F | 3.81 in. |
| June | 56.5 °F | 77.6 °F | 4.26 in. |
| July | 60.9 °F | 82.2 °F | 3.37 in. |
| August | 58.5 °F | 79.9 °F | 3.3 in. |
| September | 50.1 °F | 73.0 °F | 2.71 in. |
| October | 36.4 °F | 58.6 °F | 2.14 in. |
| November | 23.0 °F | 41.6 °F | 1.0 in. |
| December | 10.9 °F | 27.8 °F | 0.82 in. |
| Annual | 34.1 °F | 54.6 °F | 26.49 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |