Carleton, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 17.6 °C (high). Annual precipitation averages 728.5 Millimeters. Carleton 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.3 °C | 2.4 °C | 19.56 mm |
| February | -7.4 °C | 5 °C | 22.1 mm |
| March | -2.2 °C | 11.8 °C | 38.1 mm |
| April | 3.5 °C | 17.7 °C | 65.02 mm |
| May | 10.1 °C | 23.1 °C | 118.11 mm |
| June | 16.1 °C | 28.8 °C | 102.87 mm |
| July | 18.6 °C | 31.1 °C | 99.82 mm |
| August | 17.2 °C | 29.9 °C | 84.84 mm |
| September | 12.1 °C | 26.3 °C | 65.53 mm |
| October | 4.9 °C | 19.3 °C | 55.37 mm |
| November | -2.2 °C | 11 °C | 31.24 mm |
| December | -7.2 °C | 4.2 °C | 25.91 mm |
| Annual | 4.5 °C | 17.6 °C | 728.47 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |