Arlington, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.2 °C (low) to 12.5 °C (high). Annual precipitation averages 672.8 Millimeters. 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 | -15.2 °C | -5.1 °C | 16 mm |
| February | -12.7 °C | -2.2 °C | 20.32 mm |
| March | -6.3 °C | 4.3 °C | 29.97 mm |
| April | 0.5 °C | 13.1 °C | 62.74 mm |
| May | 7.7 °C | 20 °C | 96.77 mm |
| June | 13.6 °C | 25.3 °C | 108.2 mm |
| July | 16.1 °C | 27.9 °C | 85.6 mm |
| August | 14.7 °C | 26.6 °C | 83.82 mm |
| September | 10.1 °C | 22.8 °C | 68.83 mm |
| October | 2.4 °C | 14.8 °C | 54.36 mm |
| November | -5 °C | 5.3 °C | 25.4 mm |
| December | -11.7 °C | -2.3 °C | 20.83 mm |
| Annual | 1.2 °C | 12.5 °C | 672.84 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |