Dexter, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 20.5 °C (high). Annual precipitation averages 1028.7 Millimeters. Dexter 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 | -5.4 °C | 7.2 °C | 27.43 mm |
| February | -3.6 °C | 9.7 °C | 39.12 mm |
| March | 1.5 °C | 15.3 °C | 68.33 mm |
| April | 6.9 °C | 20.5 °C | 103.12 mm |
| May | 13.1 °C | 25 °C | 161.54 mm |
| June | 18.4 °C | 30.1 °C | 151.89 mm |
| July | 20.8 °C | 32.9 °C | 103.38 mm |
| August | 19.8 °C | 32.4 °C | 112.52 mm |
| September | 15.2 °C | 28.3 °C | 78.99 mm |
| October | 8.2 °C | 21.9 °C | 86.36 mm |
| November | 1.7 °C | 14.8 °C | 55.63 mm |
| December | -3.7 °C | 8.3 °C | 40.39 mm |
| Annual | 7.7 °C | 20.5 °C | 1028.7 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 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 |