Haugan, Montana has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -0.3 °C (low) to 13.8 °C (high). Annual precipitation averages 769.6 Millimeters. Haugan is located in USDA Plant Hardiness Zone 5b. 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 | -7.2 °C | 0.7 °C | 99.31 mm |
| February | -6.7 °C | 3.4 °C | 76.2 mm |
| March | -4.1 °C | 8.3 °C | 87.12 mm |
| April | -1.3 °C | 13.1 °C | 49.02 mm |
| May | 2.3 °C | 18.8 °C | 54.86 mm |
| June | 5.8 °C | 22.7 °C | 57.15 mm |
| July | 7.9 °C | 28.9 °C | 19.81 mm |
| August | 7.1 °C | 29.1 °C | 22.61 mm |
| September | 3.4 °C | 22.5 °C | 32.51 mm |
| October | -0.4 °C | 13.6 °C | 72.9 mm |
| November | -3.6 °C | 4.6 °C | 95.76 mm |
| December | -7.1 °C | 0.2 °C | 102.36 mm |
| Annual | -0.3 °C | 13.8 °C | 769.61 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |