Spooner, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.7 °F (low) to 53.1 °F (high). Annual precipitation averages 31.9 Inches. Spooner is located in USDA Plant Hardiness Zone 4a. 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 | 2.1 °F | 21.7 °F | 0.82 in. |
| February | 5.0 °F | 27.2 °F | 0.85 in. |
| March | 17.5 °F | 39.6 °F | 1.5 in. |
| April | 30.5 °F | 54.1 °F | 2.83 in. |
| May | 42.9 °F | 67.3 °F | 3.86 in. |
| June | 53.0 °F | 76.2 °F | 4.24 in. |
| July | 57.3 °F | 80.3 °F | 4.23 in. |
| August | 55.2 °F | 78.6 °F | 4.02 in. |
| September | 47.4 °F | 69.9 °F | 3.63 in. |
| October | 35.7 °F | 56.1 °F | 3.13 in. |
| November | 23.3 °F | 39.8 °F | 1.63 in. |
| December | 10.3 °F | 26.8 °F | 1.17 in. |
| Annual | 31.7 °F | 53.1 °F | 31.91 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 4a : -30°F to -25°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 |