Timber Lake, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.3 °F (low) to 56.6 °F (high). Annual precipitation averages 19.2 Inches. Timber Lake is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.0 °F | 26.1 °F | 0.48 in. |
| February | 10.5 °F | 30.2 °F | 0.64 in. |
| March | 20.5 °F | 42.5 °F | 0.94 in. |
| April | 31.5 °F | 56.5 °F | 1.78 in. |
| May | 43.3 °F | 67.8 °F | 2.86 in. |
| June | 53.9 °F | 77.9 °F | 3.49 in. |
| July | 59.5 °F | 85.2 °F | 2.9 in. |
| August | 57.4 °F | 84.8 °F | 1.84 in. |
| September | 47.9 °F | 75.7 °F | 1.51 in. |
| October | 34.6 °F | 58.9 °F | 1.63 in. |
| November | 21.7 °F | 42.8 °F | 0.57 in. |
| December | 11.2 °F | 30.2 °F | 0.56 in. |
| Annual | 33.3 °F | 56.6 °F | 19.2 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |