Fulton, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 14.4 °C (high). Annual precipitation averages 651.8 Millimeters. Fulton is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.6 °C | -3 °C | 12.95 mm |
| February | -11.1 °C | 0.1 °C | 19.3 mm |
| March | -5.2 °C | 6.7 °C | 30.99 mm |
| April | 1.3 °C | 14.8 °C | 73.66 mm |
| May | 8.3 °C | 21.3 °C | 91.69 mm |
| June | 14.6 °C | 26.9 °C | 100.84 mm |
| July | 16.8 °C | 29.8 °C | 80.26 mm |
| August | 15.6 °C | 28.6 °C | 74.93 mm |
| September | 10.6 °C | 24.5 °C | 71.88 mm |
| October | 2.8 °C | 16.5 °C | 53.59 mm |
| November | -4.7 °C | 7.1 °C | 24.13 mm |
| December | -10.8 °C | -0.6 °C | 17.53 mm |
| Annual | 2.1 °C | 14.4 °C | 651.75 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |