Britton, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.4 °C (low) to 12 °C (high). Annual precipitation averages 610.6 Millimeters. Britton is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.7 °C | -6.5 °C | 15.49 mm |
| February | -14.3 °C | -3.7 °C | 15.75 mm |
| March | -7.4 °C | 3.3 °C | 23.37 mm |
| April | -0.1 °C | 12.4 °C | 48.77 mm |
| May | 7.2 °C | 20.1 °C | 80.26 mm |
| June | 13.3 °C | 25.3 °C | 104.9 mm |
| July | 15.7 °C | 27.9 °C | 103.89 mm |
| August | 14.3 °C | 27.3 °C | 61.72 mm |
| September | 9.2 °C | 22.7 °C | 65.28 mm |
| October | 1.7 °C | 14.3 °C | 55.63 mm |
| November | -6 °C | 4.3 °C | 18.8 mm |
| December | -12.7 °C | -3.2 °C | 16.76 mm |
| Annual | 0.4 °C | 12 °C | 610.62 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |