Garnett, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 19.3 °C (high). Annual precipitation averages 1010.9 Millimeters. Garnett is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 4.9 °C | 30.48 mm |
| February | -4.1 °C | 7.5 °C | 43.94 mm |
| March | 1.3 °C | 13.8 °C | 59.94 mm |
| April | 6.5 °C | 19.3 °C | 101.6 mm |
| May | 12.8 °C | 24.2 °C | 141.48 mm |
| June | 18.1 °C | 29.3 °C | 128.27 mm |
| July | 20.5 °C | 32.1 °C | 111.51 mm |
| August | 19.4 °C | 31.6 °C | 101.09 mm |
| September | 14.7 °C | 27.3 °C | 108.71 mm |
| October | 7.8 °C | 20.9 °C | 85.85 mm |
| November | 1.6 °C | 13.4 °C | 55.12 mm |
| December | -3.8 °C | 6.8 °C | 42.93 mm |
| Annual | 7.4 °C | 19.3 °C | 1010.92 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |