Loyal, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 53.1 °F (high). Annual precipitation averages 33.5 Inches. 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 | 4.6 °F | 22.4 °F | 1.07 in. |
| February | 7.1 °F | 27.2 °F | 1.02 in. |
| March | 19.2 °F | 39.4 °F | 1.69 in. |
| April | 32.1 °F | 53.6 °F | 3.04 in. |
| May | 44.4 °F | 66.4 °F | 3.9 in. |
| June | 54.3 °F | 75.5 °F | 4.85 in. |
| July | 58.2 °F | 79.7 °F | 3.83 in. |
| August | 55.9 °F | 77.6 °F | 4.15 in. |
| September | 47.7 °F | 70.0 °F | 3.78 in. |
| October | 35.8 °F | 56.5 °F | 2.88 in. |
| November | 24.5 °F | 41.0 °F | 1.84 in. |
| December | 12.3 °F | 27.8 °F | 1.43 in. |
| Annual | 33 °F | 53.1 °F | 33.48 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |