Shell, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.6 °C (low) to 15.6 °C (high). Annual precipitation averages 248.7 Millimeters. Shell is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.6 °C | 0.6 °C | 12.7 mm |
| February | -11.2 °C | 3.2 °C | 17.02 mm |
| March | -5.3 °C | 10.2 °C | 13.72 mm |
| April | -0.7 °C | 14.9 °C | 26.67 mm |
| May | 4.7 °C | 20.3 °C | 44.7 mm |
| June | 9.4 °C | 26.3 °C | 36.07 mm |
| July | 12.7 °C | 31.6 °C | 14.22 mm |
| August | 11.1 °C | 30.7 °C | 10.16 mm |
| September | 6 °C | 24.3 °C | 22.1 mm |
| October | -0.4 °C | 15.8 °C | 25.15 mm |
| November | -7 °C | 7.6 °C | 15.49 mm |
| December | -12.6 °C | 1.4 °C | 10.67 mm |
| Annual | -0.6 °C | 15.6 °C | 248.67 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |