Nemaha, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.9 °F (low) to 57.4 °F (high). Annual precipitation averages 32.6 Inches. Nemaha 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 | 8.7 °F | 26.5 °F | 0.76 in. |
| February | 12.8 °F | 30.9 °F | 0.95 in. |
| March | 24.8 °F | 44.8 °F | 1.82 in. |
| April | 35.7 °F | 58.6 °F | 3.57 in. |
| May | 48.3 °F | 70.2 °F | 4.52 in. |
| June | 59.3 °F | 80.2 °F | 5.17 in. |
| July | 62.8 °F | 83.0 °F | 3.53 in. |
| August | 60.1 °F | 80.6 °F | 4.42 in. |
| September | 51.1 °F | 75.1 °F | 2.94 in. |
| October | 38.5 °F | 61.7 °F | 2.34 in. |
| November | 25.7 °F | 45.4 °F | 1.48 in. |
| December | 14.9 °F | 31.7 °F | 1.11 in. |
| Annual | 36.9 °F | 57.4 °F | 32.61 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |