Elmer, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 17.5 °C (high). Annual precipitation averages 1049.8 Millimeters. Elmer is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 1.9 °C | 36.58 mm |
| February | -6.1 °C | 4.8 °C | 44.7 mm |
| March | -0.5 °C | 11.4 °C | 64.26 mm |
| April | 5.4 °C | 18.1 °C | 101.09 mm |
| May | 11.6 °C | 23.3 °C | 147.83 mm |
| June | 16.9 °C | 28.3 °C | 139.7 mm |
| July | 19.1 °C | 30.8 °C | 120.9 mm |
| August | 17.6 °C | 30.1 °C | 102.62 mm |
| September | 12.5 °C | 26.2 °C | 106.93 mm |
| October | 6.4 °C | 19.3 °C | 79.76 mm |
| November | 0.2 °C | 11.6 °C | 60.96 mm |
| December | -5.4 °C | 4.6 °C | 44.45 mm |
| Annual | 5.8 °C | 17.5 °C | 1049.78 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |