Altoona, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.9 °F (low) to 54.8 °F (high). Annual precipitation averages 33 Inches. Altoona 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 | 5.9 °F | 23.4 °F | 1.05 in. |
| February | 9.3 °F | 28.3 °F | 1.09 in. |
| March | 21.3 °F | 40.8 °F | 1.89 in. |
| April | 34.0 °F | 55.6 °F | 3.07 in. |
| May | 46.3 °F | 68.6 °F | 4.01 in. |
| June | 56.6 °F | 77.9 °F | 4.65 in. |
| July | 60.7 °F | 82.0 °F | 3.76 in. |
| August | 58.4 °F | 80.0 °F | 4.01 in. |
| September | 50.0 °F | 72.2 °F | 3.65 in. |
| October | 37.7 °F | 58.2 °F | 2.69 in. |
| November | 25.6 °F | 42.1 °F | 1.71 in. |
| December | 13.3 °F | 28.8 °F | 1.37 in. |
| Annual | 34.9 °F | 54.8 °F | 32.95 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |