Florence, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 11.8 °C (high). Annual precipitation averages 617 Millimeters. Florence 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 | -16.3 °C | -6 °C | 17.02 mm |
| February | -14.3 °C | -3.4 °C | 17.02 mm |
| March | -7.6 °C | 3.3 °C | 27.94 mm |
| April | -0.4 °C | 12 °C | 58.67 mm |
| May | 6.9 °C | 19.2 °C | 76.45 mm |
| June | 13 °C | 24.6 °C | 98.04 mm |
| July | 15.6 °C | 27.5 °C | 90.93 mm |
| August | 14.2 °C | 26.6 °C | 69.85 mm |
| September | 9.3 °C | 22.2 °C | 64.26 mm |
| October | 1.6 °C | 13.8 °C | 57.66 mm |
| November | -5.9 °C | 4.6 °C | 20.83 mm |
| December | -12.5 °C | -2.9 °C | 18.29 mm |
| Annual | 0.3 °C | 11.8 °C | 616.96 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |