Spring Valley, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12.1 °C (high). Annual precipitation averages 870.5 Millimeters. 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 | -15.2 °C | -5.3 °C | 26.16 mm |
| February | -13.4 °C | -2.5 °C | 26.16 mm |
| March | -6.5 °C | 4.4 °C | 47.24 mm |
| April | 0.7 °C | 12.6 °C | 75.95 mm |
| May | 7.6 °C | 19.6 °C | 104.65 mm |
| June | 13.3 °C | 24.8 °C | 134.37 mm |
| July | 15.7 °C | 27.2 °C | 102.36 mm |
| August | 14.3 °C | 26 °C | 112.27 mm |
| September | 9.8 °C | 21.9 °C | 91.95 mm |
| October | 2.8 °C | 14.1 °C | 70.61 mm |
| November | -4.1 °C | 5.1 °C | 43.43 mm |
| December | -11 °C | -2.3 °C | 35.31 mm |
| Annual | 1.2 °C | 12.1 °C | 870.46 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |