Spring Valley, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.1 °F (low) to 53.8 °F (high). Annual precipitation averages 34.3 Inches. Spring Valley is located in USDA Plant Hardiness Zone 4b. 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 | 4.7 °F | 22.5 °F | 1.03 in. |
| February | 7.9 °F | 27.5 °F | 1.03 in. |
| March | 20.3 °F | 39.9 °F | 1.86 in. |
| April | 33.2 °F | 54.7 °F | 2.99 in. |
| May | 45.7 °F | 67.3 °F | 4.12 in. |
| June | 56.0 °F | 76.7 °F | 5.29 in. |
| July | 60.2 °F | 80.9 °F | 4.03 in. |
| August | 57.7 °F | 78.8 °F | 4.42 in. |
| September | 49.7 °F | 71.5 °F | 3.62 in. |
| October | 37.0 °F | 57.3 °F | 2.78 in. |
| November | 24.7 °F | 41.2 °F | 1.71 in. |
| December | 12.2 °F | 27.8 °F | 1.39 in. |
| Annual | 34.1 °F | 53.8 °F | 34.27 in. |
| 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |