Nichols, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 15.8 °C (high). Annual precipitation averages 957.1 Millimeters. Nichols is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10 °C | -0.8 °C | 33.78 mm |
| February | -8.1 °C | 1.7 °C | 40.64 mm |
| March | -2 °C | 8.9 °C | 60.45 mm |
| April | 4.2 °C | 16.7 °C | 93.98 mm |
| May | 10.8 °C | 22.6 °C | 123.19 mm |
| June | 16.4 °C | 27.7 °C | 129.29 mm |
| July | 18.3 °C | 29.6 °C | 106.43 mm |
| August | 16.9 °C | 28.6 °C | 105.41 mm |
| September | 12.2 °C | 25.3 °C | 89.15 mm |
| October | 5.6 °C | 17.9 °C | 73.91 mm |
| November | -1 °C | 9.4 °C | 56.13 mm |
| December | -6.8 °C | 2.1 °C | 44.7 mm |
| Annual | 4.7 °C | 15.8 °C | 957.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |