Conner, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.2 °F (low) to 58.5 °F (high). Annual precipitation averages 16.2 Inches. 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 | 17.2 °F | 35.6 °F | 1.24 in. |
| February | 19.0 °F | 40.5 °F | 1.28 in. |
| March | 24.7 °F | 49.4 °F | 1.08 in. |
| April | 29.9 °F | 56.6 °F | 1.18 in. |
| May | 36.8 °F | 66.2 °F | 1.92 in. |
| June | 43.0 °F | 73.8 °F | 2.03 in. |
| July | 47.4 °F | 84.8 °F | 0.9 in. |
| August | 45.7 °F | 84.0 °F | 0.77 in. |
| September | 39.1 °F | 74.1 °F | 1.23 in. |
| October | 31.0 °F | 59.0 °F | 1.48 in. |
| November | 23.2 °F | 43.4 °F | 1.66 in. |
| December | 16.8 °F | 34.1 °F | 1.4 in. |
| Annual | 31.2 °F | 58.5 °F | 16.17 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |