Dubois, Wyoming has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -2.8 °C (low) to 11.9 °C (high). Annual precipitation averages 285.5 Millimeters. Dubois is located in USDA Plant Hardiness Zone 4b. 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 | -11.2 °C | 0.7 °C | 7.11 mm |
| February | -11.6 °C | 1.7 °C | 12.19 mm |
| March | -7.4 °C | 5.9 °C | 13.97 mm |
| April | -3.8 °C | 9.8 °C | 34.29 mm |
| May | 0.4 °C | 14.9 °C | 49.78 mm |
| June | 4.2 °C | 20.8 °C | 39.88 mm |
| July | 7.2 °C | 26.2 °C | 25.65 mm |
| August | 6.3 °C | 25.4 °C | 21.59 mm |
| September | 2.4 °C | 19.8 °C | 35.05 mm |
| October | -2.1 °C | 12.5 °C | 22.1 mm |
| November | -7.3 °C | 4.9 °C | 14.48 mm |
| December | -11.1 °C | 0.4 °C | 9.4 mm |
| Annual | -2.8 °C | 11.9 °C | 285.49 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |