Frazer, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.3 °C (low) to 13.9 °C (high). Annual precipitation averages 338.6 Millimeters. Frazer is located in USDA Plant Hardiness Zone 4a. 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 | -16.8 °C | -4.3 °C | 9.65 mm |
| February | -14.4 °C | -1.2 °C | 7.87 mm |
| March | -7.7 °C | 6.4 °C | 15.24 mm |
| April | -1.2 °C | 15 °C | 23.37 mm |
| May | 4.8 °C | 20.8 °C | 52.83 mm |
| June | 10.3 °C | 25.7 °C | 71.63 mm |
| July | 13.2 °C | 30.6 °C | 55.12 mm |
| August | 12.1 °C | 30.5 °C | 31.75 mm |
| September | 6.5 °C | 24.2 °C | 30.48 mm |
| October | -0.7 °C | 15.2 °C | 20.32 mm |
| November | -7.9 °C | 5.5 °C | 12.19 mm |
| December | -14.1 °C | -1.9 °C | 8.13 mm |
| Annual | -1.3 °C | 13.9 °C | 338.58 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |