Smithfield, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 63.5 °F (high). Annual precipitation averages 23.9 Inches. Smithfield 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 | 14.7 °F | 37.8 °F | 0.42 in. |
| February | 18.2 °F | 41.3 °F | 0.65 in. |
| March | 25.9 °F | 52.7 °F | 1.27 in. |
| April | 36.5 °F | 61.9 °F | 2.39 in. |
| May | 47.3 °F | 72.5 °F | 3.71 in. |
| June | 58.2 °F | 83.6 °F | 3.57 in. |
| July | 62.6 °F | 88.4 °F | 3.74 in. |
| August | 60.4 °F | 85.5 °F | 3.12 in. |
| September | 51.1 °F | 79.4 °F | 1.73 in. |
| October | 37.9 °F | 66.5 °F | 1.78 in. |
| November | 25.5 °F | 51.7 °F | 0.85 in. |
| December | 16.6 °F | 40.1 °F | 0.64 in. |
| Annual | 37.9 °F | 63.5 °F | 23.87 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |