Timber Lake, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.7 °C (low) to 13.6 °C (high). Annual precipitation averages 487.7 Millimeters. 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 | -13.9 °C | -3.3 °C | 12.19 mm |
| February | -11.9 °C | -1 °C | 16.26 mm |
| March | -6.4 °C | 5.8 °C | 23.88 mm |
| April | -0.3 °C | 13.6 °C | 45.21 mm |
| May | 6.3 °C | 19.9 °C | 72.64 mm |
| June | 12.2 °C | 25.5 °C | 88.65 mm |
| July | 15.3 °C | 29.6 °C | 73.66 mm |
| August | 14.1 °C | 29.3 °C | 46.74 mm |
| September | 8.8 °C | 24.3 °C | 38.35 mm |
| October | 1.4 °C | 14.9 °C | 41.4 mm |
| November | -5.7 °C | 6 °C | 14.48 mm |
| December | -11.6 °C | -1 °C | 14.22 mm |
| Annual | 0.7 °C | 13.6 °C | 487.68 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |