Geddes, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.5 °F (low) to 60 °F (high). Annual precipitation averages 24.9 Inches. Geddes is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.3 °F | 31.2 °F | 0.52 in. |
| February | 14.0 °F | 36.1 °F | 0.7 in. |
| March | 23.8 °F | 47.7 °F | 1.16 in. |
| April | 34.7 °F | 59.4 °F | 2.99 in. |
| May | 46.5 °F | 70.6 °F | 3.68 in. |
| June | 57.5 °F | 80.8 °F | 3.83 in. |
| July | 62.8 °F | 87.4 °F | 2.89 in. |
| August | 60.5 °F | 85.2 °F | 3.0 in. |
| September | 51.0 °F | 77.5 °F | 2.6 in. |
| October | 37.5 °F | 62.4 °F | 2.07 in. |
| November | 24.5 °F | 47.0 °F | 0.84 in. |
| December | 14.3 °F | 34.1 °F | 0.65 in. |
| Annual | 36.5 °F | 60 °F | 24.93 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |