Arnold, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 16.8 °C (high). Annual precipitation averages 606.1 Millimeters. Arnold is located in USDA Plant Hardiness Zone 5a. 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 | -10.6 °C | 3.1 °C | 11.94 mm |
| February | -9.1 °C | 4.8 °C | 16 mm |
| March | -4.2 °C | 11 °C | 30.48 mm |
| April | 1 °C | 15.9 °C | 70.61 mm |
| May | 7.3 °C | 21.6 °C | 101.6 mm |
| June | 13.3 °C | 27.4 °C | 97.54 mm |
| July | 16.1 °C | 30.6 °C | 83.06 mm |
| August | 14.8 °C | 29.5 °C | 66.8 mm |
| September | 9.3 °C | 25.6 °C | 43.69 mm |
| October | 1.7 °C | 18.2 °C | 49.53 mm |
| November | -5 °C | 10.2 °C | 21.59 mm |
| December | -9.6 °C | 4.1 °C | 13.21 mm |
| Annual | 2.1 °C | 16.8 °C | 606.05 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |