Atlantic City, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.7 °C (low) to 10 °C (high). Annual precipitation averages 438.4 Millimeters. Atlantic City is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.4 °C | -2.3 °C | 31.24 mm |
| February | -13.2 °C | -1.5 °C | 36.58 mm |
| March | -9.4 °C | 2.8 °C | 41.15 mm |
| April | -5.4 °C | 7.9 °C | 51.82 mm |
| May | -0.8 °C | 13.6 °C | 58.42 mm |
| June | 4.1 °C | 20 °C | 33.02 mm |
| July | 9.3 °C | 25.1 °C | 18.8 mm |
| August | 8.3 °C | 24.3 °C | 28.96 mm |
| September | 3.1 °C | 18.8 °C | 32.26 mm |
| October | -3.6 °C | 10.9 °C | 34.8 mm |
| November | -9.2 °C | 2.7 °C | 33.78 mm |
| December | -13.7 °C | -2.4 °C | 37.59 mm |
| Annual | -3.7 °C | 10 °C | 438.42 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°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 |