Riverton, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.7 °C (low) to 18.1 °C (high). Annual precipitation averages 661.4 Millimeters. Riverton 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 | -9.9 °C | 3.2 °C | 13.97 mm |
| February | -8.2 °C | 5.6 °C | 18.03 mm |
| March | -2.9 °C | 12 °C | 36.07 mm |
| April | 2.7 °C | 17.8 °C | 59.18 mm |
| May | 9.3 °C | 23.4 °C | 107.19 mm |
| June | 15.4 °C | 29.6 °C | 93.47 mm |
| July | 18.2 °C | 32.2 °C | 103.12 mm |
| August | 16.9 °C | 30.8 °C | 82.8 mm |
| September | 11.3 °C | 26.7 °C | 50.55 mm |
| October | 3.7 °C | 19.6 °C | 49.53 mm |
| November | -3.3 °C | 11.4 °C | 27.43 mm |
| December | -8.4 °C | 4.7 °C | 20.07 mm |
| Annual | 3.7 °C | 18.1 °C | 661.41 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |