Linn, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.2 °F (low) to 65.3 °F (high). Annual precipitation averages 44.3 Inches. Linn 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 | 20.6 °F | 39.4 °F | 2.31 in. |
| February | 24.2 °F | 44.5 °F | 2.17 in. |
| March | 32.9 °F | 55.0 °F | 3.32 in. |
| April | 43.3 °F | 66.4 °F | 4.67 in. |
| May | 53.9 °F | 74.9 °F | 5.31 in. |
| June | 62.9 °F | 82.9 °F | 4.82 in. |
| July | 67.0 °F | 87.4 °F | 4.76 in. |
| August | 64.9 °F | 86.6 °F | 3.9 in. |
| September | 56.4 °F | 79.5 °F | 4.13 in. |
| October | 44.9 °F | 68.1 °F | 3.2 in. |
| November | 34.0 °F | 54.9 °F | 3.2 in. |
| December | 25.2 °F | 43.7 °F | 2.51 in. |
| Annual | 44.2 °F | 65.3 °F | 44.3 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 |