Tonganoxie, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 18.3 °C (high). Annual precipitation averages 997.2 Millimeters. Tonganoxie is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 3.5 °C | 28.96 mm |
| February | -5.1 °C | 6.3 °C | 37.85 mm |
| March | 0.3 °C | 12.7 °C | 60.2 mm |
| April | 6.2 °C | 18.4 °C | 100.33 mm |
| May | 12.3 °C | 23.7 °C | 131.32 mm |
| June | 17.9 °C | 29 °C | 134.62 mm |
| July | 20.2 °C | 31.5 °C | 110.24 mm |
| August | 19.1 °C | 30.7 °C | 113.79 mm |
| September | 14.1 °C | 26.4 °C | 102.87 mm |
| October | 7.2 °C | 19.7 °C | 82.55 mm |
| November | 0.5 °C | 12.2 °C | 53.34 mm |
| December | -4.9 °C | 5.5 °C | 41.15 mm |
| Annual | 6.7 °C | 18.3 °C | 997.22 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |