Callaway, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.6 °C (low) to 10.2 °C (high). Annual precipitation averages 644.2 Millimeters. Callaway 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 | -18.3 °C | -8.2 °C | 17.78 mm |
| February | -16.9 °C | -5.6 °C | 16 mm |
| March | -8.8 °C | 1.7 °C | 25.4 mm |
| April | -0.9 °C | 10.8 °C | 43.94 mm |
| May | 6.3 °C | 18.5 °C | 82.3 mm |
| June | 12.4 °C | 23.7 °C | 113.28 mm |
| July | 14.8 °C | 26.2 °C | 92.46 mm |
| August | 13.5 °C | 25.4 °C | 67.82 mm |
| September | 8.7 °C | 20.8 °C | 71.63 mm |
| October | 1.7 °C | 12 °C | 68.07 mm |
| November | -6.3 °C | 2.4 °C | 24.13 mm |
| December | -13.8 °C | -4.9 °C | 21.34 mm |
| Annual | -0.6 °C | 10.2 °C | 644.15 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 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |