Riverton, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.7 °F (low) to 64.6 °F (high). Annual precipitation averages 26 Inches. 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 | 14.2 °F | 37.7 °F | 0.55 in. |
| February | 17.3 °F | 42.1 °F | 0.71 in. |
| March | 26.7 °F | 53.6 °F | 1.42 in. |
| April | 36.9 °F | 64.1 °F | 2.33 in. |
| May | 48.7 °F | 74.1 °F | 4.22 in. |
| June | 59.8 °F | 85.2 °F | 3.68 in. |
| July | 64.7 °F | 90.0 °F | 4.06 in. |
| August | 62.4 °F | 87.5 °F | 3.26 in. |
| September | 52.4 °F | 80.1 °F | 1.99 in. |
| October | 38.7 °F | 67.2 °F | 1.95 in. |
| November | 26.0 °F | 52.5 °F | 1.08 in. |
| December | 16.9 °F | 40.5 °F | 0.79 in. |
| Annual | 38.7 °F | 64.6 °F | 26.04 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |