Foster, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.8 °C (low) to 15.8 °C (high). Annual precipitation averages 718.3 Millimeters. Foster is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.6 °C | -0.1 °C | 15.24 mm |
| February | -9.5 °C | 2.6 °C | 20.57 mm |
| March | -4.1 °C | 9.1 °C | 40.39 mm |
| April | 1.9 °C | 16 °C | 76.96 mm |
| May | 8.6 °C | 22.1 °C | 104.14 mm |
| June | 14.7 °C | 27.6 °C | 104.9 mm |
| July | 17.2 °C | 29.9 °C | 77.98 mm |
| August | 15.9 °C | 28.7 °C | 94.49 mm |
| September | 10.6 °C | 25 °C | 67.31 mm |
| October | 3.2 °C | 17.7 °C | 61.98 mm |
| November | -4.1 °C | 8.8 °C | 30.99 mm |
| December | -9.6 °C | 1.6 °C | 23.37 mm |
| Annual | 2.8 °C | 15.8 °C | 718.32 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |