Johnson, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 17.1 °C (high). Annual precipitation averages 833.6 Millimeters. Johnson is located in USDA Plant Hardiness Zone 5b. 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 | -9.7 °C | 1.3 °C | 20.07 mm |
| February | -7.6 °C | 4.1 °C | 27.69 mm |
| March | -1.8 °C | 11.2 °C | 51.05 mm |
| April | 4.1 °C | 17.3 °C | 78.49 mm |
| May | 10.6 °C | 22.9 °C | 133.86 mm |
| June | 16.4 °C | 28.3 °C | 116.33 mm |
| July | 18.7 °C | 30.6 °C | 104.9 mm |
| August | 17.5 °C | 29.7 °C | 87.38 mm |
| September | 12.3 °C | 25.9 °C | 77.72 mm |
| October | 5.4 °C | 19.2 °C | 64.52 mm |
| November | -1.7 °C | 10.6 °C | 40.89 mm |
| December | -7.1 °C | 3.7 °C | 30.73 mm |
| Annual | 4.8 °C | 17.1 °C | 833.63 mm |
| 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 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 |