Raynesford, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.9 °C (low) to 13.9 °C (high). Annual precipitation averages 440.4 Millimeters. Raynesford is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.4 °C | 2.3 °C | 15.49 mm |
| February | -9.8 °C | 3.2 °C | 13.97 mm |
| March | -6.2 °C | 7.7 °C | 18.03 mm |
| April | -1.9 °C | 12.6 °C | 45.21 mm |
| May | 2.6 °C | 17.7 °C | 62.74 mm |
| June | 6.8 °C | 22.2 °C | 75.69 mm |
| July | 9.7 °C | 28.2 °C | 46.23 mm |
| August | 8.7 °C | 28.1 °C | 39.12 mm |
| September | 4.7 °C | 22.1 °C | 45.72 mm |
| October | -0.1 °C | 13.9 °C | 39.12 mm |
| November | -5.7 °C | 6.9 °C | 19.3 mm |
| December | -9.7 °C | 2.4 °C | 19.81 mm |
| Annual | -0.9 °C | 13.9 °C | 440.43 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |