Condon, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.3 °C (low) to 13.3 °C (high). Annual precipitation averages 558.3 Millimeters. Condon is located in USDA Plant Hardiness Zone 5a. 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 | -9.2 °C | 0.7 °C | 54.1 mm |
| February | -8.7 °C | 3 °C | 42.16 mm |
| March | -5.3 °C | 7.9 °C | 41.66 mm |
| April | -1.9 °C | 12.2 °C | 48.51 mm |
| May | 1.7 °C | 17.8 °C | 55.63 mm |
| June | 5.3 °C | 21.7 °C | 71.63 mm |
| July | 7.7 °C | 28.1 °C | 26.92 mm |
| August | 6.9 °C | 28 °C | 24.89 mm |
| September | 3.3 °C | 21.8 °C | 37.85 mm |
| October | -1.2 °C | 13 °C | 49.28 mm |
| November | -5.3 °C | 4.8 °C | 53.34 mm |
| December | -8.9 °C | 0.2 °C | 52.32 mm |
| Annual | -1.3 °C | 13.3 °C | 558.29 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°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 |