Petersburg, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 15.8 °C (high). Annual precipitation averages 697 Millimeters. Petersburg is located in USDA Plant Hardiness Zone 5b. 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 | -11.2 °C | 0.7 °C | 13.72 mm |
| February | -9.2 °C | 3 °C | 18.8 mm |
| March | -4.1 °C | 9.3 °C | 37.08 mm |
| April | 1.7 °C | 15.6 °C | 72.9 mm |
| May | 8.1 °C | 21.4 °C | 106.17 mm |
| June | 14.3 °C | 27.3 °C | 103.38 mm |
| July | 16.8 °C | 29.6 °C | 81.03 mm |
| August | 15.5 °C | 28.3 °C | 94.74 mm |
| September | 10.2 °C | 24.8 °C | 63.75 mm |
| October | 2.8 °C | 17.6 °C | 57.4 mm |
| November | -4.2 °C | 9.1 °C | 28.7 mm |
| December | -9.2 °C | 2.4 °C | 19.3 mm |
| Annual | 2.6 °C | 15.8 °C | 696.97 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 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 |