Loyal, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 11.7 °C (high). Annual precipitation averages 850.4 Millimeters. Loyal is located in USDA Plant Hardiness Zone 4b. 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 | -15.2 °C | -5.3 °C | 27.18 mm |
| February | -13.8 °C | -2.7 °C | 25.91 mm |
| March | -7.1 °C | 4.1 °C | 42.93 mm |
| April | 0.1 °C | 12 °C | 77.22 mm |
| May | 6.9 °C | 19.1 °C | 99.06 mm |
| June | 12.4 °C | 24.2 °C | 123.19 mm |
| July | 14.6 °C | 26.5 °C | 97.28 mm |
| August | 13.3 °C | 25.3 °C | 105.41 mm |
| September | 8.7 °C | 21.1 °C | 96.01 mm |
| October | 2.1 °C | 13.6 °C | 73.15 mm |
| November | -4.2 °C | 5 °C | 46.74 mm |
| December | -10.9 °C | -2.3 °C | 36.32 mm |
| Annual | 0.6 °C | 11.7 °C | 850.4 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 4b : -31.7°C to -28.9°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 |