Alexandria, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2 °C (low) to 14.4 °C (high). Annual precipitation averages 657.6 Millimeters. Alexandria is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.5 °C | -2.9 °C | 13.21 mm |
| February | -11.1 °C | 0.2 °C | 19.81 mm |
| March | -5.2 °C | 6.8 °C | 30.48 mm |
| April | 1.3 °C | 14.8 °C | 74.17 mm |
| May | 8.3 °C | 21.3 °C | 90.42 mm |
| June | 14.6 °C | 26.9 °C | 102.36 mm |
| July | 16.8 °C | 29.8 °C | 81.53 mm |
| August | 15.5 °C | 28.6 °C | 75.95 mm |
| September | 10.5 °C | 24.5 °C | 73.15 mm |
| October | 2.8 °C | 16.5 °C | 54.36 mm |
| November | -4.7 °C | 7.1 °C | 24.64 mm |
| December | -10.8 °C | -0.6 °C | 17.53 mm |
| Annual | 2 °C | 14.4 °C | 657.61 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |