Palmyra, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 17 °C (high). Annual precipitation averages 825.3 Millimeters. Palmyra is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | 1.2 °C | 20.83 mm |
| February | -7.3 °C | 4 °C | 27.18 mm |
| March | -1.9 °C | 10.7 °C | 46.48 mm |
| April | 4.3 °C | 17.2 °C | 75.95 mm |
| May | 10.4 °C | 22.9 °C | 138.68 mm |
| June | 16.4 °C | 28.3 °C | 118.36 mm |
| July | 18.7 °C | 30.7 °C | 99.06 mm |
| August | 17.2 °C | 29.7 °C | 90.42 mm |
| September | 12.1 °C | 26.1 °C | 77.22 mm |
| October | 5 °C | 19.1 °C | 63.25 mm |
| November | -2.1 °C | 10.4 °C | 37.34 mm |
| December | -7.4 °C | 3.5 °C | 30.48 mm |
| Annual | 4.6 °C | 17 °C | 825.25 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |