De Borgia, Montana has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -0.1 °C (low) to 14 °C (high). Annual precipitation averages 710.4 Millimeters. 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 | -7 °C | 0.8 °C | 80.77 mm |
| February | -6.6 °C | 3.5 °C | 65.53 mm |
| March | -3.9 °C | 8.4 °C | 77.47 mm |
| April | -1.1 °C | 13.3 °C | 44.7 mm |
| May | 2.6 °C | 18.9 °C | 54.61 mm |
| June | 6.1 °C | 22.8 °C | 56.9 mm |
| July | 8.2 °C | 29.1 °C | 19.56 mm |
| August | 7.4 °C | 29.3 °C | 23.88 mm |
| September | 3.7 °C | 22.7 °C | 30.48 mm |
| October | -0.3 °C | 13.7 °C | 68.83 mm |
| November | -3.5 °C | 4.7 °C | 83.57 mm |
| December | -6.9 °C | 0.3 °C | 104.14 mm |
| Annual | -0.1 °C | 14 °C | 710.44 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |