Charlos Heights, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.8 °F (low) to 58.9 °F (high). Annual precipitation averages 14.8 Inches. Charlos Heights is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.9 °F | 35.9 °F | 1.08 in. |
| February | 19.7 °F | 40.7 °F | 1.06 in. |
| March | 25.3 °F | 49.6 °F | 0.98 in. |
| April | 30.6 °F | 57.6 °F | 1.14 in. |
| May | 37.3 °F | 67.0 °F | 1.7 in. |
| June | 43.6 °F | 74.5 °F | 2.03 in. |
| July | 48.4 °F | 85.5 °F | 0.91 in. |
| August | 46.7 °F | 84.5 °F | 0.89 in. |
| September | 39.4 °F | 74.4 °F | 1.06 in. |
| October | 31.1 °F | 59.2 °F | 1.26 in. |
| November | 23.8 °F | 43.6 °F | 1.37 in. |
| December | 17.6 °F | 34.4 °F | 1.3 in. |
| Annual | 31.8 °F | 58.9 °F | 14.78 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |