Ravalli, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 58.5 °F (high). Annual precipitation averages 16.1 Inches. Ravalli is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.3 °F | 35.4 °F | 1.19 in. |
| February | 22.5 °F | 39.0 °F | 0.93 in. |
| March | 28.1 °F | 49.3 °F | 0.97 in. |
| April | 33.9 °F | 57.5 °F | 1.54 in. |
| May | 40.9 °F | 67.2 °F | 2.04 in. |
| June | 47.5 °F | 74.0 °F | 2.5 in. |
| July | 52.6 °F | 85.4 °F | 1.01 in. |
| August | 51.4 °F | 85.1 °F | 0.91 in. |
| September | 44.1 °F | 73.7 °F | 1.15 in. |
| October | 35.0 °F | 58.0 °F | 1.35 in. |
| November | 27.6 °F | 43.0 °F | 1.28 in. |
| December | 22.0 °F | 34.8 °F | 1.22 in. |
| Annual | 35.7 °F | 58.5 °F | 16.09 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |