Franklin, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 18.2 °C (high). Annual precipitation averages 1059.5 Millimeters. Franklin is located in USDA Plant Hardiness Zone 6a. 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 | -7.2 °C | 3.1 °C | 44.96 mm |
| February | -5.1 °C | 6 °C | 52.58 mm |
| March | 0.5 °C | 12.1 °C | 71.88 mm |
| April | 6.2 °C | 18.8 °C | 110.74 mm |
| May | 12.3 °C | 23.9 °C | 129.29 mm |
| June | 17.8 °C | 29.1 °C | 122.94 mm |
| July | 19.7 °C | 31.1 °C | 112.27 mm |
| August | 18.4 °C | 30.4 °C | 102.36 mm |
| September | 13.4 °C | 26.6 °C | 103.89 mm |
| October | 6.8 °C | 19.8 °C | 87.63 mm |
| November | 0.8 °C | 12.3 °C | 69.6 mm |
| December | -4.4 °C | 5.6 °C | 51.31 mm |
| Annual | 6.6 °C | 18.2 °C | 1059.45 mm |
| 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 6a : -23.3°C to -20.6°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 |