Hyannis, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.5 °C (low) to 16.1 °C (high). Annual precipitation averages 510.8 Millimeters. Hyannis 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 | -10 °C | 2.9 °C | 9.91 mm |
| February | -9.2 °C | 4.3 °C | 12.45 mm |
| March | -4.4 °C | 10.2 °C | 27.18 mm |
| April | 0.1 °C | 14.4 °C | 57.4 mm |
| May | 5.9 °C | 20.4 °C | 78.23 mm |
| June | 11.7 °C | 26.7 °C | 82.04 mm |
| July | 15.1 °C | 30.4 °C | 73.66 mm |
| August | 13.7 °C | 29.2 °C | 61.21 mm |
| September | 8.3 °C | 24.7 °C | 39.62 mm |
| October | 1 °C | 16.9 °C | 44.2 mm |
| November | -5.1 °C | 9.5 °C | 13.97 mm |
| December | -9.6 °C | 3.3 °C | 10.92 mm |
| Annual | 1.5 °C | 16.1 °C | 510.79 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 | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |