Britton, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.6 °F (low) to 53.6 °F (high). Annual precipitation averages 24 Inches. 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 | 1.9 °F | 20.3 °F | 0.61 in. |
| February | 6.3 °F | 25.3 °F | 0.62 in. |
| March | 18.6 °F | 38.0 °F | 0.92 in. |
| April | 31.8 °F | 54.4 °F | 1.92 in. |
| May | 45.0 °F | 68.1 °F | 3.16 in. |
| June | 55.9 °F | 77.5 °F | 4.13 in. |
| July | 60.3 °F | 82.3 °F | 4.09 in. |
| August | 57.8 °F | 81.1 °F | 2.43 in. |
| September | 48.6 °F | 72.9 °F | 2.57 in. |
| October | 35.0 °F | 57.7 °F | 2.19 in. |
| November | 21.2 °F | 39.8 °F | 0.74 in. |
| December | 9.1 °F | 26.2 °F | 0.66 in. |
| Annual | 32.6 °F | 53.6 °F | 24.04 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |