Lemmon, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31.6 °F (low) to 56.5 °F (high). Annual precipitation averages 17.6 Inches. Lemmon 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °F | 27.5 °F | 0.3 in. |
| February | 10.2 °F | 31.4 °F | 0.43 in. |
| March | 19.4 °F | 42.7 °F | 0.79 in. |
| April | 29.7 °F | 56.0 °F | 1.5 in. |
| May | 41.3 °F | 67.0 °F | 2.71 in. |
| June | 51.4 °F | 76.9 °F | 3.01 in. |
| July | 56.9 °F | 85.1 °F | 2.84 in. |
| August | 54.6 °F | 83.9 °F | 1.95 in. |
| September | 45.1 °F | 75.4 °F | 1.48 in. |
| October | 32.5 °F | 58.9 °F | 1.53 in. |
| November | 20.0 °F | 42.8 °F | 0.6 in. |
| December | 10.4 °F | 30.9 °F | 0.44 in. |
| Annual | 31.6 °F | 56.5 °F | 17.58 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |