Porcupine, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.5 °F (low) to 61.2 °F (high). Annual precipitation averages 20 Inches. Porcupine is located in USDA Plant Hardiness Zone 5a. 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 | 13.0 °F | 36.5 °F | 0.44 in. |
| February | 15.1 °F | 39.4 °F | 0.55 in. |
| March | 23.6 °F | 50.1 °F | 1.22 in. |
| April | 31.8 °F | 58.3 °F | 2.29 in. |
| May | 42.7 °F | 68.2 °F | 3.26 in. |
| June | 53.1 °F | 79.5 °F | 3.61 in. |
| July | 59.5 °F | 88.1 °F | 2.32 in. |
| August | 57.3 °F | 87.3 °F | 1.8 in. |
| September | 46.9 °F | 78.0 °F | 1.57 in. |
| October | 34.1 °F | 62.1 °F | 1.77 in. |
| November | 22.7 °F | 48.7 °F | 0.66 in. |
| December | 14.4 °F | 37.7 °F | 0.51 in. |
| Annual | 34.5 °F | 61.2 °F | 20 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |