Almena, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.4 °C (low) to 11.3 °C (high). Annual precipitation averages 841 Millimeters. Almena 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 | -15.9 °C | -5.9 °C | 24.38 mm |
| February | -14.3 °C | -3.1 °C | 24.13 mm |
| March | -7.4 °C | 3.7 °C | 42.67 mm |
| April | -0.1 °C | 11.6 °C | 73.66 mm |
| May | 6.9 °C | 18.9 °C | 98.81 mm |
| June | 12.4 °C | 24 °C | 114.81 mm |
| July | 14.7 °C | 26.4 °C | 107.44 mm |
| August | 13.4 °C | 25.3 °C | 108.71 mm |
| September | 9 °C | 20.9 °C | 89.92 mm |
| October | 2.4 °C | 13.1 °C | 78.49 mm |
| November | -4.4 °C | 4.3 °C | 45.21 mm |
| December | -11.6 °C | -3.1 °C | 32.77 mm |
| Annual | 0.4 °C | 11.3 °C | 841 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |