Newcastle, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.7 °C (low) to 15.4 °C (high). Annual precipitation averages 744.7 Millimeters. Newcastle 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 | -12.2 °C | -1.2 °C | 14.99 mm |
| February | -9.9 °C | 1.4 °C | 19.81 mm |
| March | -4.2 °C | 8.3 °C | 42.16 mm |
| April | 2 °C | 15.9 °C | 83.31 mm |
| May | 8.8 °C | 22.1 °C | 105.16 mm |
| June | 15 °C | 27.7 °C | 114.55 mm |
| July | 17.2 °C | 29.7 °C | 80.52 mm |
| August | 15.8 °C | 28.4 °C | 80.01 mm |
| September | 10.6 °C | 25.1 °C | 77.22 mm |
| October | 3.4 °C | 17.8 °C | 68.33 mm |
| November | -4.1 °C | 8.4 °C | 35.56 mm |
| December | -9.7 °C | 0.9 °C | 23.11 mm |
| Annual | 2.7 °C | 15.4 °C | 744.73 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 |