Sheridan, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.3 °F (low) to 56.5 °F (high). Annual precipitation averages 10.9 Inches. 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 | 14.6 °F | 34.6 °F | 0.36 in. |
| February | 15.7 °F | 37.6 °F | 0.4 in. |
| March | 22.6 °F | 46.3 °F | 0.47 in. |
| April | 28.9 °F | 54.3 °F | 1.08 in. |
| May | 36.5 °F | 63.4 °F | 1.5 in. |
| June | 43.2 °F | 71.8 °F | 2.32 in. |
| July | 48.7 °F | 82.4 °F | 1.14 in. |
| August | 47.1 °F | 81.4 °F | 0.92 in. |
| September | 40.1 °F | 71.4 °F | 0.95 in. |
| October | 30.7 °F | 57.7 °F | 0.8 in. |
| November | 21.3 °F | 43.3 °F | 0.51 in. |
| December | 13.6 °F | 33.6 °F | 0.48 in. |
| Annual | 30.3 °F | 56.5 °F | 10.93 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |