McCammon, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 59.5 °F (high). Annual precipitation averages 16.1 Inches. McCammon is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.4 °F | 32.7 °F | 1.81 in. |
| February | 17.5 °F | 37.7 °F | 1.39 in. |
| March | 25.4 °F | 48.2 °F | 1.47 in. |
| April | 30.6 °F | 58.0 °F | 1.28 in. |
| May | 38.1 °F | 67.5 °F | 1.95 in. |
| June | 43.9 °F | 77.2 °F | 1.21 in. |
| July | 50.6 °F | 87.8 °F | 0.63 in. |
| August | 49.4 °F | 86.9 °F | 0.97 in. |
| September | 40.1 °F | 76.4 °F | 1.28 in. |
| October | 30.9 °F | 62.2 °F | 1.28 in. |
| November | 22.4 °F | 45.5 °F | 1.01 in. |
| December | 15.5 °F | 34.0 °F | 1.86 in. |
| Annual | 31.6 °F | 59.5 °F | 16.14 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |