Hazelton, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.6 °C (low) to 21.7 °C (high). Annual precipitation averages 781.8 Millimeters. Hazelton 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 | -5.3 °C | 8.4 °C | 22.1 mm |
| February | -3.7 °C | 10.5 °C | 27.18 mm |
| March | 1.4 °C | 16.2 °C | 55.63 mm |
| April | 6.3 °C | 21.2 °C | 71.12 mm |
| May | 12.7 °C | 26.5 °C | 108.97 mm |
| June | 18.4 °C | 32.2 °C | 115.82 mm |
| July | 21 °C | 34.9 °C | 89.92 mm |
| August | 20.1 °C | 33.9 °C | 96.52 mm |
| September | 15.4 °C | 29.8 °C | 60.71 mm |
| October | 8 °C | 22.8 °C | 65.79 mm |
| November | 1.1 °C | 15.3 °C | 34.29 mm |
| December | -4.2 °C | 8.8 °C | 33.78 mm |
| Annual | 7.6 °C | 21.7 °C | 781.83 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |