Chalco, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.5 °C (high). Annual precipitation averages 831.3 Millimeters. Chalco is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | 0.4 °C | 21.08 mm |
| February | -7.8 °C | 3.1 °C | 28.45 mm |
| March | -1.9 °C | 10.1 °C | 45.72 mm |
| April | 4.1 °C | 17.1 °C | 83.31 mm |
| May | 10.8 °C | 22.6 °C | 123.7 mm |
| June | 16.7 °C | 28.3 °C | 129.03 mm |
| July | 19.1 °C | 30.3 °C | 85.09 mm |
| August | 17.8 °C | 29.2 °C | 102.11 mm |
| September | 12.3 °C | 25.6 °C | 77.72 mm |
| October | 5.4 °C | 18.4 °C | 65.79 mm |
| November | -1.7 °C | 9.9 °C | 36.07 mm |
| December | -7.2 °C | 2.8 °C | 33.27 mm |
| Annual | 4.8 °C | 16.5 °C | 831.34 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |