Grenola, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.6 °F (low) to 68.7 °F (high). Annual precipitation averages 40 Inches. Grenola 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 | 21.9 °F | 44.3 °F | 1.01 in. |
| February | 25.2 °F | 49.0 °F | 1.57 in. |
| March | 34.3 °F | 59.2 °F | 2.76 in. |
| April | 44.5 °F | 68.8 °F | 4.0 in. |
| May | 55.4 °F | 76.7 °F | 5.87 in. |
| June | 65.0 °F | 85.5 °F | 5.94 in. |
| July | 69.2 °F | 90.9 °F | 4.04 in. |
| August | 67.2 °F | 90.3 °F | 3.98 in. |
| September | 58.7 °F | 82.8 °F | 3.54 in. |
| October | 46.1 °F | 71.4 °F | 3.4 in. |
| November | 34.7 °F | 58.4 °F | 2.18 in. |
| December | 24.7 °F | 46.7 °F | 1.68 in. |
| Annual | 45.6 °F | 68.7 °F | 39.97 in. |
| 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 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 |