Calhoun, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.6 °F (low) to 65.7 °F (high). Annual precipitation averages 43.9 Inches. Calhoun is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.4 °F | 39.9 °F | 1.78 in. |
| February | 24.2 °F | 45.1 °F | 2.01 in. |
| March | 33.3 °F | 55.6 °F | 2.88 in. |
| April | 43.1 °F | 65.9 °F | 4.62 in. |
| May | 54.3 °F | 74.9 °F | 5.55 in. |
| June | 64.1 °F | 83.7 °F | 5.26 in. |
| July | 68.0 °F | 88.3 °F | 4.5 in. |
| August | 65.9 °F | 87.2 °F | 4.13 in. |
| September | 57.2 °F | 79.6 °F | 4.41 in. |
| October | 44.9 °F | 68.5 °F | 3.62 in. |
| November | 34.1 °F | 55.3 °F | 3.0 in. |
| December | 25.2 °F | 44.0 °F | 2.17 in. |
| Annual | 44.6 °F | 65.7 °F | 43.93 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |