Carter, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -2.8 °C (low) to 13.6 °C (high). Annual precipitation averages 259.3 Millimeters. Carter is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.2 °C | -0.4 °C | 13.46 mm |
| February | -12.2 °C | 1.2 °C | 13.46 mm |
| March | -6.9 °C | 6.9 °C | 16.76 mm |
| April | -3.2 °C | 12.2 °C | 25.4 mm |
| May | 1.3 °C | 17.7 °C | 42.42 mm |
| June | 5.1 °C | 24.4 °C | 25.4 mm |
| July | 8.9 °C | 29.4 °C | 19.05 mm |
| August | 7.8 °C | 28.5 °C | 21.08 mm |
| September | 3 °C | 22.9 °C | 25.91 mm |
| October | -2.5 °C | 14.8 °C | 24.64 mm |
| November | -8.1 °C | 6.1 °C | 17.53 mm |
| December | -13 °C | -0.1 °C | 14.22 mm |
| Annual | -2.8 °C | 13.6 °C | 259.33 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| 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 | BSk - Cold Semi-Arid Climate |