Rexford, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 14.2 °C (high). Annual precipitation averages 370.8 Millimeters. Rexford 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | -0.2 °C | 24.38 mm |
| February | -7 °C | 3.4 °C | 18.29 mm |
| March | -3.5 °C | 8.9 °C | 21.59 mm |
| April | -0.4 °C | 14.1 °C | 31.75 mm |
| May | 3.8 °C | 19.8 °C | 43.69 mm |
| June | 7.4 °C | 23.3 °C | 52.83 mm |
| July | 10.3 °C | 29.7 °C | 30.48 mm |
| August | 9.3 °C | 29.7 °C | 24.89 mm |
| September | 5.2 °C | 23.3 °C | 30.99 mm |
| October | 0.6 °C | 13.9 °C | 32 mm |
| November | -3.1 °C | 4.7 °C | 32.26 mm |
| December | -6.9 °C | -0.5 °C | 27.69 mm |
| Annual | 0.7 °C | 14.2 °C | 370.84 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |