Clarkson, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.3 °C (low) to 15.7 °C (high). Annual precipitation averages 739.6 Millimeters. Clarkson 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 | -11.2 °C | -0.2 °C | 16 mm |
| February | -9.1 °C | 2.3 °C | 19.81 mm |
| March | -3.4 °C | 9.2 °C | 37.59 mm |
| April | 2.6 °C | 16.1 °C | 75.44 mm |
| May | 9.2 °C | 22.1 °C | 118.87 mm |
| June | 15.3 °C | 27.6 °C | 119.63 mm |
| July | 17.6 °C | 29.6 °C | 83.06 mm |
| August | 16.2 °C | 28.3 °C | 87.88 mm |
| September | 10.9 °C | 24.7 °C | 70.87 mm |
| October | 3.7 °C | 17.6 °C | 58.42 mm |
| November | -3.6 °C | 8.9 °C | 29.46 mm |
| December | -8.9 °C | 1.7 °C | 22.61 mm |
| Annual | 3.3 °C | 15.7 °C | 739.64 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |