Slater, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 18.2 °C (high). Annual precipitation averages 1044.2 Millimeters. Slater 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 | -6.1 °C | 3.4 °C | 38.1 mm |
| February | -4.1 °C | 6.1 °C | 48.51 mm |
| March | 1.2 °C | 12.5 °C | 70.87 mm |
| April | 6.9 °C | 18.5 °C | 108.97 mm |
| May | 13 °C | 23.8 °C | 134.87 mm |
| June | 18.1 °C | 28.7 °C | 130.05 mm |
| July | 20.2 °C | 30.8 °C | 115.57 mm |
| August | 18.9 °C | 30.2 °C | 99.31 mm |
| September | 14.2 °C | 26.3 °C | 100.08 mm |
| October | 7.9 °C | 19.7 °C | 84.07 mm |
| November | 1.7 °C | 12.3 °C | 65.02 mm |
| December | -3.3 °C | 5.7 °C | 48.77 mm |
| Annual | 7.4 °C | 18.2 °C | 1044.19 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |