Ashton, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.9 °C (low) to 16.6 °C (high). Annual precipitation averages 679.7 Millimeters. Ashton 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 | -10.8 °C | 1.9 °C | 13.72 mm |
| February | -8.9 °C | 4 °C | 16.51 mm |
| March | -3.7 °C | 10.6 °C | 39.12 mm |
| April | 2 °C | 16.5 °C | 75.44 mm |
| May | 8.3 °C | 21.9 °C | 107.7 mm |
| June | 14.4 °C | 27.8 °C | 103.63 mm |
| July | 17.2 °C | 30.4 °C | 84.58 mm |
| August | 15.9 °C | 29.3 °C | 83.82 mm |
| September | 10.3 °C | 25.3 °C | 56.9 mm |
| October | 2.8 °C | 18.1 °C | 50.8 mm |
| November | -4 °C | 10 °C | 27.18 mm |
| December | -9.1 °C | 3.3 °C | 20.32 mm |
| Annual | 2.9 °C | 16.6 °C | 679.72 mm |
| 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |