Big Piney, Wyoming has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -6.3 °C (low) to 11.7 °C (high). Annual precipitation averages 220.5 Millimeters. Big Piney is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around July 21 - July 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.2 °C | -3.2 °C | 18.54 mm |
| February | -17.4 °C | -1.4 °C | 16.26 mm |
| March | -10.4 °C | 4.7 °C | 17.27 mm |
| April | -5.8 °C | 10.7 °C | 23.37 mm |
| May | -1 °C | 16.1 °C | 26.92 mm |
| June | 2.9 °C | 22.2 °C | 18.54 mm |
| July | 5.9 °C | 26.9 °C | 14.73 mm |
| August | 4.8 °C | 26.6 °C | 13.46 mm |
| September | 0.2 °C | 21.3 °C | 16.26 mm |
| October | -5.3 °C | 13.8 °C | 22.1 mm |
| November | -12.1 °C | 4.6 °C | 14.22 mm |
| December | -18 °C | -2.4 °C | 18.8 mm |
| Annual | -6.3 °C | 11.7 °C | 220.47 mm |
| Average First Frost Date | July 21 - July 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |