Glasco, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 19.2 °C (high). Annual precipitation averages 725.4 Millimeters. Glasco is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.6 °C | 4.3 °C | 17.78 mm |
| February | -5.7 °C | 6.9 °C | 24.13 mm |
| March | -0.6 °C | 13.4 °C | 40.13 mm |
| April | 4.9 °C | 19.1 °C | 62.23 mm |
| May | 11.3 °C | 24.3 °C | 114.55 mm |
| June | 17.3 °C | 30.6 °C | 103.89 mm |
| July | 20.1 °C | 33.4 °C | 110.74 mm |
| August | 18.8 °C | 31.9 °C | 86.36 mm |
| September | 13.7 °C | 27.8 °C | 65.53 mm |
| October | 6.4 °C | 20.8 °C | 46.48 mm |
| November | -0.6 °C | 12.4 °C | 27.18 mm |
| December | -5.8 °C | 5.7 °C | 26.42 mm |
| Annual | 6 °C | 19.2 °C | 725.42 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |