Sheridan, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 13.6 °C (high). Annual precipitation averages 277.6 Millimeters. Sheridan 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 | -9.7 °C | 1.4 °C | 9.14 mm |
| February | -9.1 °C | 3.1 °C | 10.16 mm |
| March | -5.2 °C | 7.9 °C | 11.94 mm |
| April | -1.7 °C | 12.4 °C | 27.43 mm |
| May | 2.5 °C | 17.4 °C | 38.1 mm |
| June | 6.2 °C | 22.1 °C | 58.93 mm |
| July | 9.3 °C | 28 °C | 28.96 mm |
| August | 8.4 °C | 27.4 °C | 23.37 mm |
| September | 4.5 °C | 21.9 °C | 24.13 mm |
| October | -0.7 °C | 14.3 °C | 20.32 mm |
| November | -5.9 °C | 6.3 °C | 12.95 mm |
| December | -10.2 °C | 0.9 °C | 12.19 mm |
| Annual | -1 °C | 13.6 °C | 277.62 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 |