Linn, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 18.5 °C (high). Annual precipitation averages 1125.2 Millimeters. 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 | -6.3 °C | 4.1 °C | 58.67 mm |
| February | -4.3 °C | 6.9 °C | 55.12 mm |
| March | 0.5 °C | 12.8 °C | 84.33 mm |
| April | 6.3 °C | 19.1 °C | 118.62 mm |
| May | 12.2 °C | 23.8 °C | 134.87 mm |
| June | 17.2 °C | 28.3 °C | 122.43 mm |
| July | 19.4 °C | 30.8 °C | 120.9 mm |
| August | 18.3 °C | 30.3 °C | 99.06 mm |
| September | 13.6 °C | 26.4 °C | 104.9 mm |
| October | 7.2 °C | 20.1 °C | 81.28 mm |
| November | 1.1 °C | 12.7 °C | 81.28 mm |
| December | -3.8 °C | 6.5 °C | 63.75 mm |
| Annual | 6.8 °C | 18.5 °C | 1125.21 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |