Pierpont, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 53.9 °F (high). Annual precipitation averages 23.9 Inches. Pierpont 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °F | 21.0 °F | 0.6 in. |
| February | 6.8 °F | 26.3 °F | 0.58 in. |
| March | 19.0 °F | 38.8 °F | 1.06 in. |
| April | 32.0 °F | 54.7 °F | 2.19 in. |
| May | 45.1 °F | 67.7 °F | 3.16 in. |
| June | 55.9 °F | 77.3 °F | 4.1 in. |
| July | 60.5 °F | 82.1 °F | 3.73 in. |
| August | 58.3 °F | 81.0 °F | 2.39 in. |
| September | 49.4 °F | 72.8 °F | 2.38 in. |
| October | 35.5 °F | 57.7 °F | 2.17 in. |
| November | 21.8 °F | 40.5 °F | 0.81 in. |
| December | 9.5 °F | 26.7 °F | 0.69 in. |
| Annual | 33 °F | 53.9 °F | 23.86 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |