Alexandria, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.7 °F (low) to 57.9 °F (high). Annual precipitation averages 25.9 Inches. 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 | 7.7 °F | 26.7 °F | 0.52 in. |
| February | 12.1 °F | 32.3 °F | 0.78 in. |
| March | 22.7 °F | 44.2 °F | 1.2 in. |
| April | 34.4 °F | 58.6 °F | 2.92 in. |
| May | 47.0 °F | 70.4 °F | 3.56 in. |
| June | 58.2 °F | 80.4 °F | 4.03 in. |
| July | 62.2 °F | 85.6 °F | 3.21 in. |
| August | 59.9 °F | 83.4 °F | 2.99 in. |
| September | 50.9 °F | 76.1 °F | 2.88 in. |
| October | 37.0 °F | 61.7 °F | 2.14 in. |
| November | 23.5 °F | 44.7 °F | 0.97 in. |
| December | 12.6 °F | 30.9 °F | 0.69 in. |
| Annual | 35.7 °F | 57.9 °F | 25.89 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |