Alexandria, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 16.9 °C (high). Annual precipitation averages 1023.6 Millimeters. Alexandria is located in USDA Plant Hardiness Zone 6a. 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 | -7.9 °C | 1.3 °C | 42.67 mm |
| February | -5.9 °C | 3.9 °C | 47.75 mm |
| March | -0.4 °C | 10.4 °C | 65.53 mm |
| April | 5.8 °C | 17.4 °C | 102.87 mm |
| May | 12 °C | 23 °C | 138.43 mm |
| June | 17.6 °C | 28.1 °C | 129.03 mm |
| July | 19.6 °C | 30.2 °C | 107.7 mm |
| August | 18.4 °C | 29.3 °C | 95.5 mm |
| September | 13.8 °C | 25.7 °C | 93.22 mm |
| October | 7.2 °C | 18.7 °C | 83.57 mm |
| November | 0.7 °C | 10.8 °C | 67.31 mm |
| December | -4.8 °C | 3.9 °C | 50.04 mm |
| Annual | 6.3 °C | 16.9 °C | 1023.62 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 6a : -23.3°C to -20.6°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 |