Norfolk, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37 °F (low) to 59.9 °F (high). Annual precipitation averages 28.2 Inches. Norfolk is located in USDA Plant Hardiness Zone 5a. 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 | 10.7 °F | 31.0 °F | 0.58 in. |
| February | 14.4 °F | 35.5 °F | 0.76 in. |
| March | 24.7 °F | 47.9 °F | 1.48 in. |
| April | 35.5 °F | 60.1 °F | 2.89 in. |
| May | 47.9 °F | 71.3 °F | 4.11 in. |
| June | 58.9 °F | 81.2 °F | 4.54 in. |
| July | 63.1 °F | 85.2 °F | 3.19 in. |
| August | 60.5 °F | 82.9 °F | 3.72 in. |
| September | 51.0 °F | 76.6 °F | 2.54 in. |
| October | 37.8 °F | 63.7 °F | 2.29 in. |
| November | 24.8 °F | 48.1 °F | 1.2 in. |
| December | 15.0 °F | 34.7 °F | 0.86 in. |
| Annual | 37 °F | 59.9 °F | 28.16 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |