Frontenac, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.7 °F (low) to 67.9 °F (high). Annual precipitation averages 46.2 Inches. Frontenac is located in USDA Plant Hardiness Zone 7a. 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 | 23.8 °F | 43.2 °F | 1.57 in. |
| February | 27.4 °F | 48.3 °F | 1.89 in. |
| March | 36.0 °F | 58.3 °F | 3.12 in. |
| April | 45.5 °F | 67.8 °F | 4.93 in. |
| May | 56.0 °F | 76.1 °F | 6.85 in. |
| June | 65.4 °F | 85.1 °F | 6.07 in. |
| July | 69.7 °F | 89.9 °F | 4.35 in. |
| August | 67.4 °F | 89.4 °F | 3.7 in. |
| September | 58.9 °F | 81.7 °F | 4.69 in. |
| October | 47.0 °F | 70.4 °F | 3.74 in. |
| November | 36.1 °F | 57.5 °F | 2.96 in. |
| December | 27.3 °F | 46.5 °F | 2.29 in. |
| Annual | 46.7 °F | 67.9 °F | 46.16 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |