Ovando, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 26.5 °F (low) to 55.9 °F (high). Annual precipitation averages 16.8 Inches. Ovando is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.7 °F | 31.5 °F | 1.37 in. |
| February | 12.5 °F | 36.4 °F | 1.07 in. |
| March | 19.2 °F | 45.3 °F | 0.97 in. |
| April | 26.7 °F | 54.6 °F | 1.04 in. |
| May | 33.2 °F | 64.8 °F | 1.98 in. |
| June | 39.7 °F | 72.1 °F | 2.3 in. |
| July | 43.1 °F | 83.6 °F | 0.95 in. |
| August | 41.6 °F | 83.4 °F | 1.06 in. |
| September | 35.0 °F | 72.4 °F | 1.52 in. |
| October | 26.5 °F | 56.0 °F | 1.4 in. |
| November | 18.7 °F | 40.1 °F | 1.52 in. |
| December | 11.2 °F | 30.8 °F | 1.57 in. |
| Annual | 26.5 °F | 55.9 °F | 16.75 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |