Turtle River, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.4 °C (low) to 9.9 °C (high). Annual precipitation averages 641.4 Millimeters. Turtle River is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.2 °C | -8.3 °C | 18.03 mm |
| February | -17.6 °C | -4.9 °C | 16.51 mm |
| March | -9.9 °C | 2.4 °C | 24.89 mm |
| April | -2.1 °C | 10.2 °C | 42.93 mm |
| May | 5.4 °C | 17.9 °C | 73.15 mm |
| June | 11.4 °C | 23.1 °C | 105.16 mm |
| July | 14 °C | 25.6 °C | 93.47 mm |
| August | 12.7 °C | 24.8 °C | 77.98 mm |
| September | 7.9 °C | 19.7 °C | 76.2 mm |
| October | 1.3 °C | 11.2 °C | 61.98 mm |
| November | -6.4 °C | 2.1 °C | 29.21 mm |
| December | -14.4 °C | -5.2 °C | 21.84 mm |
| Annual | -1.4 °C | 9.9 °C | 641.35 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |