Harrisburg, Nebraska has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.2 °F (low) to 62.9 °F (high). Annual precipitation averages 16.5 Inches. Harrisburg is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.7 °F | 40.8 °F | 0.33 in. |
| February | 17.1 °F | 43.2 °F | 0.55 in. |
| March | 24.2 °F | 52.6 °F | 0.97 in. |
| April | 31.2 °F | 59.6 °F | 1.88 in. |
| May | 41.3 °F | 69.0 °F | 2.8 in. |
| June | 51.0 °F | 81.2 °F | 2.44 in. |
| July | 57.4 °F | 88.6 °F | 1.87 in. |
| August | 55.1 °F | 86.9 °F | 1.67 in. |
| September | 45.7 °F | 78.1 °F | 1.52 in. |
| October | 33.2 °F | 63.5 °F | 1.39 in. |
| November | 22.9 °F | 50.7 °F | 0.58 in. |
| December | 15.2 °F | 41.0 °F | 0.52 in. |
| Annual | 34.2 °F | 62.9 °F | 16.52 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 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 | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |