Garnett, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.3 °F (low) to 66.7 °F (high). Annual precipitation averages 39.8 Inches. 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 | 20.9 °F | 40.9 °F | 1.2 in. |
| February | 24.6 °F | 45.5 °F | 1.73 in. |
| March | 34.3 °F | 56.9 °F | 2.36 in. |
| April | 43.7 °F | 66.8 °F | 4.0 in. |
| May | 55.1 °F | 75.5 °F | 5.57 in. |
| June | 64.5 °F | 84.8 °F | 5.05 in. |
| July | 68.9 °F | 89.7 °F | 4.39 in. |
| August | 66.9 °F | 88.8 °F | 3.98 in. |
| September | 58.5 °F | 81.1 °F | 4.28 in. |
| October | 46.1 °F | 69.6 °F | 3.38 in. |
| November | 34.8 °F | 56.2 °F | 2.17 in. |
| December | 25.1 °F | 44.3 °F | 1.69 in. |
| Annual | 45.3 °F | 66.7 °F | 39.8 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |