Siren, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.9 °F (low) to 53.4 °F (high). Annual precipitation averages 32.3 Inches. Siren 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 | 2.0 °F | 21.9 °F | 0.84 in. |
| February | 5.2 °F | 27.3 °F | 0.93 in. |
| March | 18.0 °F | 39.8 °F | 1.54 in. |
| April | 30.6 °F | 53.8 °F | 2.8 in. |
| May | 43.3 °F | 67.4 °F | 3.87 in. |
| June | 53.4 °F | 76.3 °F | 4.42 in. |
| July | 57.8 °F | 80.6 °F | 4.16 in. |
| August | 55.6 °F | 78.7 °F | 4.15 in. |
| September | 47.4 °F | 70.6 °F | 3.41 in. |
| October | 35.6 °F | 56.5 °F | 3.26 in. |
| November | 23.1 °F | 40.1 °F | 1.69 in. |
| December | 10.2 °F | 27.2 °F | 1.23 in. |
| Annual | 31.9 °F | 53.4 °F | 32.3 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 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |