West Line, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 18.6 °C (high). Annual precipitation averages 1077 Millimeters. West Line is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 4.3 °C | 34.8 mm |
| February | -4.5 °C | 6.7 °C | 45.97 mm |
| March | 0.9 °C | 12.8 °C | 67.06 mm |
| April | 6.6 °C | 18.7 °C | 107.44 mm |
| May | 12.6 °C | 23.7 °C | 148.08 mm |
| June | 17.8 °C | 28.8 °C | 143.51 mm |
| July | 20.1 °C | 31.5 °C | 112.27 mm |
| August | 18.9 °C | 30.8 °C | 108.97 mm |
| September | 14.2 °C | 26.7 °C | 110.74 mm |
| October | 7.3 °C | 19.9 °C | 90.17 mm |
| November | 1.3 °C | 12.8 °C | 61.21 mm |
| December | -4.2 °C | 6.3 °C | 46.74 mm |
| Annual | 7 °C | 18.6 °C | 1076.96 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |