Conner, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 14.7 °C (high). Annual precipitation averages 410.7 Millimeters. Conner 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 | -8.2 °C | 2 °C | 31.5 mm |
| February | -7.2 °C | 4.7 °C | 32.51 mm |
| March | -4.1 °C | 9.7 °C | 27.43 mm |
| April | -1.2 °C | 13.7 °C | 29.97 mm |
| May | 2.7 °C | 19 °C | 48.77 mm |
| June | 6.1 °C | 23.2 °C | 51.56 mm |
| July | 8.6 °C | 29.3 °C | 22.86 mm |
| August | 7.6 °C | 28.9 °C | 19.56 mm |
| September | 3.9 °C | 23.4 °C | 31.24 mm |
| October | -0.6 °C | 15 °C | 37.59 mm |
| November | -4.9 °C | 6.3 °C | 42.16 mm |
| December | -8.4 °C | 1.2 °C | 35.56 mm |
| Annual | -0.5 °C | 14.7 °C | 410.71 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |