South Park, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.4 °C (low) to 12 °C (high). Annual precipitation averages 421.9 Millimeters. South Park is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 1 - Aug. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.7 °C | -2.1 °C | 41.15 mm |
| February | -12.4 °C | 0.2 °C | 34.54 mm |
| March | -7.8 °C | 5.3 °C | 29.97 mm |
| April | -3.2 °C | 10.6 °C | 29.46 mm |
| May | 0.8 °C | 16.6 °C | 48.01 mm |
| June | 4.3 °C | 22 °C | 42.16 mm |
| July | 6.9 °C | 27.6 °C | 24.64 mm |
| August | 6 °C | 26.9 °C | 27.18 mm |
| September | 2 °C | 21.7 °C | 37.59 mm |
| October | -2.5 °C | 13.4 °C | 31.5 mm |
| November | -7.8 °C | 4.3 °C | 33.27 mm |
| December | -13 °C | -2.1 °C | 42.42 mm |
| Annual | -3.4 °C | 12 °C | 421.89 mm |
| Average First Frost Date | Aug. 1 - Aug. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |