Montrose, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.4 °C (low) to 13.2 °C (high). Annual precipitation averages 680 Millimeters. Montrose is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.5 °C | -3.9 °C | 13.46 mm |
| February | -12.2 °C | -1.2 °C | 18.29 mm |
| March | -5.8 °C | 5.6 °C | 32 mm |
| April | 0.7 °C | 13.3 °C | 71.63 mm |
| May | 7.9 °C | 20.2 °C | 95 mm |
| June | 14.2 °C | 25.8 °C | 105.16 mm |
| July | 16.4 °C | 28.4 °C | 84.07 mm |
| August | 14.9 °C | 26.9 °C | 84.07 mm |
| September | 9.9 °C | 23 °C | 76.45 mm |
| October | 2.1 °C | 15.4 °C | 55.88 mm |
| November | -5.6 °C | 6.2 °C | 25.15 mm |
| December | -11.6 °C | -1.4 °C | 18.8 mm |
| Annual | 1.4 °C | 13.2 °C | 679.96 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |