Palmyra, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.5 °F (low) to 57 °F (high). Annual precipitation averages 37 Inches. Palmyra is located in USDA Plant Hardiness Zone 5b. 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 | 12.0 °F | 27.8 °F | 1.66 in. |
| February | 14.7 °F | 31.6 °F | 1.65 in. |
| March | 24.6 °F | 43.4 °F | 2.06 in. |
| April | 35.7 °F | 56.7 °F | 3.73 in. |
| May | 46.9 °F | 68.7 °F | 4.22 in. |
| June | 57.1 °F | 78.7 °F | 5.08 in. |
| July | 61.2 °F | 82.4 °F | 3.91 in. |
| August | 59.4 °F | 80.7 °F | 4.05 in. |
| September | 51.2 °F | 74.0 °F | 3.42 in. |
| October | 39.9 °F | 60.7 °F | 2.98 in. |
| November | 28.8 °F | 45.9 °F | 2.27 in. |
| December | 18.5 °F | 33.2 °F | 1.93 in. |
| Annual | 37.5 °F | 57 °F | 36.96 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |