Harrison, Nebraska has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.2 °F (low) to 58.2 °F (high). Annual precipitation averages 17.6 Inches. Harrison is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.1 °F | 35.8 °F | 0.36 in. |
| February | 15.0 °F | 37.2 °F | 0.45 in. |
| March | 22.2 °F | 47.5 °F | 1.03 in. |
| April | 29.0 °F | 54.3 °F | 2.22 in. |
| May | 39.0 °F | 64.1 °F | 3.64 in. |
| June | 48.9 °F | 75.9 °F | 2.82 in. |
| July | 55.6 °F | 84.8 °F | 1.87 in. |
| August | 53.6 °F | 83.9 °F | 1.36 in. |
| September | 44.1 °F | 74.3 °F | 1.36 in. |
| October | 31.6 °F | 58.6 °F | 1.47 in. |
| November | 20.9 °F | 45.9 °F | 0.55 in. |
| December | 13.3 °F | 36.2 °F | 0.43 in. |
| Annual | 32.2 °F | 58.2 °F | 17.56 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |