Jennings, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.6 °C (low) to 19 °C (high). Annual precipitation averages 551.9 Millimeters. Jennings is located in USDA Plant Hardiness Zone 6a. 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 | -9 °C | 5.3 °C | 9.91 mm |
| February | -7.7 °C | 7.2 °C | 13.46 mm |
| March | -3 °C | 13.3 °C | 27.43 mm |
| April | 2.2 °C | 18.3 °C | 51.56 mm |
| May | 8.6 °C | 23.6 °C | 86.36 mm |
| June | 14.7 °C | 30 °C | 72.14 mm |
| July | 17.8 °C | 32.9 °C | 90.93 mm |
| August | 16.5 °C | 31.5 °C | 77.72 mm |
| September | 11.2 °C | 27.3 °C | 45.97 mm |
| October | 3.4 °C | 19.9 °C | 41.66 mm |
| November | -3.4 °C | 12.3 °C | 18.8 mm |
| December | -8.1 °C | 5.9 °C | 16 mm |
| Annual | 3.6 °C | 19 °C | 551.94 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |