Avon, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.6 °C (low) to 12.9 °C (high). Annual precipitation averages 372.1 Millimeters. Avon is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.1 °C | 0.4 °C | 20.32 mm |
| February | -10.4 °C | 2.3 °C | 18.03 mm |
| March | -6.6 °C | 7.2 °C | 21.34 mm |
| April | -3.1 °C | 11.6 °C | 36.07 mm |
| May | 1.1 °C | 16.9 °C | 50.29 mm |
| June | 4.6 °C | 21.4 °C | 65.53 mm |
| July | 7.2 °C | 27.8 °C | 30.48 mm |
| August | 6.1 °C | 27.4 °C | 29.21 mm |
| September | 2.3 °C | 21.4 °C | 32 mm |
| October | -2.7 °C | 13.1 °C | 29.72 mm |
| November | -7.3 °C | 5 °C | 21.84 mm |
| December | -11.2 °C | 0 °C | 17.27 mm |
| Annual | -2.6 °C | 12.9 °C | 372.1 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | May 21 - May 31 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |