Hamilton, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 19.5 °C (high). Annual precipitation averages 963.7 Millimeters. Hamilton is located in USDA Plant Hardiness Zone 6b. 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 | -6.7 °C | 5.4 °C | 22.35 mm |
| February | -4.6 °C | 8.2 °C | 37.08 mm |
| March | 0.7 °C | 14.1 °C | 62.23 mm |
| April | 6.3 °C | 19.6 °C | 92.2 mm |
| May | 12.4 °C | 24.1 °C | 139.45 mm |
| June | 17.8 °C | 29.2 °C | 134.11 mm |
| July | 20.2 °C | 32.1 °C | 110.24 mm |
| August | 19.1 °C | 31.8 °C | 94.74 mm |
| September | 14.3 °C | 27.4 °C | 98.3 mm |
| October | 7.2 °C | 21 °C | 80.01 mm |
| November | 0.8 °C | 13.7 °C | 55.37 mm |
| December | -4.6 °C | 7.3 °C | 37.59 mm |
| Annual | 6.9 °C | 19.5 °C | 963.67 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |