Reliance, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.3 °C (low) to 14 °C (high). Annual precipitation averages 252.7 Millimeters. Reliance is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.8 °C | 0.2 °C | 13.97 mm |
| February | -10.8 °C | 1.8 °C | 12.45 mm |
| March | -5.8 °C | 7.6 °C | 17.27 mm |
| April | -1.9 °C | 12.9 °C | 32.26 mm |
| May | 2.4 °C | 18.2 °C | 47.24 mm |
| June | 6.8 °C | 24.7 °C | 22.86 mm |
| July | 10.6 °C | 29.5 °C | 13.97 mm |
| August | 9.7 °C | 28.3 °C | 14.73 mm |
| September | 4.8 °C | 23.1 °C | 26.16 mm |
| October | -0.9 °C | 15 °C | 23.37 mm |
| November | -6.5 °C | 6.3 °C | 16 mm |
| December | -11.8 °C | 0.2 °C | 12.45 mm |
| Annual | -1.3 °C | 14 °C | 252.73 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |