Fort Ripley, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.2 °C (low) to 11.3 °C (high). Annual precipitation averages 730.3 Millimeters. Fort Ripley is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.6 °C | -6.8 °C | 17.02 mm |
| February | -15.8 °C | -3.8 °C | 20.57 mm |
| March | -8.3 °C | 3.4 °C | 35.81 mm |
| April | -0.8 °C | 11.7 °C | 60.71 mm |
| May | 6.7 °C | 19.2 °C | 89.41 mm |
| June | 12.6 °C | 24.4 °C | 111.51 mm |
| July | 15 °C | 27.2 °C | 106.43 mm |
| August | 13.4 °C | 25.9 °C | 88.65 mm |
| September | 8.7 °C | 21.3 °C | 74.17 mm |
| October | 1.8 °C | 13 °C | 72.14 mm |
| November | -5.4 °C | 3.7 °C | 31.24 mm |
| December | -12.8 °C | -3.8 °C | 22.61 mm |
| Annual | -0.2 °C | 11.3 °C | 730.27 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |