Garden City, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.5 °F (low) to 52.7 °F (high). Annual precipitation averages 24.1 Inches. Garden City 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 | 2.8 °F | 20.7 °F | 0.59 in. |
| February | 6.5 °F | 25.5 °F | 0.65 in. |
| March | 18.4 °F | 37.9 °F | 1.0 in. |
| April | 31.2 °F | 53.0 °F | 2.22 in. |
| May | 44.2 °F | 65.8 °F | 3.19 in. |
| June | 55.1 °F | 75.7 °F | 4.04 in. |
| July | 59.9 °F | 80.8 °F | 3.55 in. |
| August | 57.6 °F | 79.2 °F | 2.63 in. |
| September | 48.8 °F | 71.2 °F | 2.53 in. |
| October | 34.9 °F | 56.1 °F | 2.26 in. |
| November | 21.3 °F | 39.9 °F | 0.81 in. |
| December | 9.8 °F | 26.3 °F | 0.67 in. |
| Annual | 32.5 °F | 52.7 °F | 24.14 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 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |