Franklin, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 19.9 °C (high). Annual precipitation averages 1166.1 Millimeters. Franklin 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 | -4.7 °C | 6.1 °C | 40.13 mm |
| February | -2.6 °C | 8.9 °C | 47.75 mm |
| March | 2.2 °C | 14.6 °C | 80.26 mm |
| April | 7.5 °C | 19.8 °C | 123.95 mm |
| May | 13.3 °C | 24.4 °C | 171.45 mm |
| June | 18.6 °C | 29.6 °C | 150.88 mm |
| July | 21 °C | 32.2 °C | 109.73 mm |
| August | 19.7 °C | 31.9 °C | 97.54 mm |
| September | 15.1 °C | 27.6 °C | 118.36 mm |
| October | 8.4 °C | 21.3 °C | 94.74 mm |
| November | 2.2 °C | 14.1 °C | 74.17 mm |
| December | -2.7 °C | 7.9 °C | 57.15 mm |
| Annual | 8.2 °C | 19.9 °C | 1166.11 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |