Junction City, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34 °F (low) to 53.6 °F (high). Annual precipitation averages 33.5 Inches. Junction City 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.4 °F | 23.6 °F | 1.15 in. |
| February | 8.8 °F | 28.0 °F | 1.05 in. |
| March | 20.0 °F | 39.9 °F | 1.7 in. |
| April | 32.7 °F | 53.9 °F | 3.2 in. |
| May | 45.0 °F | 66.6 °F | 3.93 in. |
| June | 55.0 °F | 75.7 °F | 4.72 in. |
| July | 58.8 °F | 80.2 °F | 3.8 in. |
| August | 56.9 °F | 78.0 °F | 4.04 in. |
| September | 48.7 °F | 70.5 °F | 3.67 in. |
| October | 36.8 °F | 56.6 °F | 2.86 in. |
| November | 25.3 °F | 41.7 °F | 1.86 in. |
| December | 13.4 °F | 28.7 °F | 1.49 in. |
| Annual | 34 °F | 53.6 °F | 33.47 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |