Blue River, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.5 °F (low) to 57.9 °F (high). Annual precipitation averages 36.6 Inches. Blue River is located in USDA Plant Hardiness Zone 5a. 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 | 8.8 °F | 27.7 °F | 1.26 in. |
| February | 12.2 °F | 32.3 °F | 1.26 in. |
| March | 23.4 °F | 44.6 °F | 2.04 in. |
| April | 35.6 °F | 58.4 °F | 3.81 in. |
| May | 47.1 °F | 70.5 °F | 4.4 in. |
| June | 57.5 °F | 80.0 °F | 5.43 in. |
| July | 61.5 °F | 83.6 °F | 4.46 in. |
| August | 59.6 °F | 81.8 °F | 4.0 in. |
| September | 50.7 °F | 74.6 °F | 3.61 in. |
| October | 38.4 °F | 61.7 °F | 2.65 in. |
| November | 26.8 °F | 45.8 °F | 2.06 in. |
| December | 15.9 °F | 33.2 °F | 1.57 in. |
| Annual | 36.5 °F | 57.9 °F | 36.55 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 5a : -20°F to -15°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 |