De Borgia, Montana has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 31.8 °F (low) to 57.2 °F (high). Annual precipitation averages 28 Inches. De Borgia 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.4 °F | 33.5 °F | 3.18 in. |
| February | 20.1 °F | 38.3 °F | 2.58 in. |
| March | 24.9 °F | 47.2 °F | 3.05 in. |
| April | 30.0 °F | 55.9 °F | 1.76 in. |
| May | 36.6 °F | 66.1 °F | 2.15 in. |
| June | 43.0 °F | 73.1 °F | 2.24 in. |
| July | 46.7 °F | 84.4 °F | 0.77 in. |
| August | 45.3 °F | 84.7 °F | 0.94 in. |
| September | 38.7 °F | 72.9 °F | 1.2 in. |
| October | 31.5 °F | 56.7 °F | 2.71 in. |
| November | 25.7 °F | 40.5 °F | 3.29 in. |
| December | 19.6 °F | 32.5 °F | 4.1 in. |
| Annual | 31.8 °F | 57.2 °F | 27.97 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |