McCammon, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 15.3 °C (high). Annual precipitation averages 409.9 Millimeters. 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 | -9.8 °C | 0.4 °C | 45.97 mm |
| February | -8.1 °C | 3.2 °C | 35.31 mm |
| March | -3.7 °C | 9 °C | 37.34 mm |
| April | -0.8 °C | 14.4 °C | 32.51 mm |
| May | 3.4 °C | 19.7 °C | 49.53 mm |
| June | 6.6 °C | 25.1 °C | 30.73 mm |
| July | 10.3 °C | 31 °C | 16 mm |
| August | 9.7 °C | 30.5 °C | 24.64 mm |
| September | 4.5 °C | 24.7 °C | 32.51 mm |
| October | -0.6 °C | 16.8 °C | 32.51 mm |
| November | -5.3 °C | 7.5 °C | 25.65 mm |
| December | -9.2 °C | 1.1 °C | 47.24 mm |
| Annual | -0.3 °C | 15.3 °C | 409.94 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |