Opolis, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 20 °C (high). Annual precipitation averages 1180.3 Millimeters. Opolis 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 | -4.4 °C | 6.3 °C | 41.66 mm |
| February | -2.6 °C | 9.2 °C | 49.53 mm |
| March | 2.3 °C | 14.7 °C | 78.49 mm |
| April | 7.5 °C | 19.9 °C | 125.22 mm |
| May | 13.3 °C | 24.5 °C | 175.26 mm |
| June | 18.4 °C | 29.5 °C | 148.84 mm |
| July | 20.7 °C | 32.1 °C | 112.52 mm |
| August | 19.6 °C | 31.9 °C | 92.2 mm |
| September | 14.9 °C | 27.7 °C | 121.16 mm |
| October | 8.3 °C | 21.4 °C | 96.01 mm |
| November | 2.3 °C | 14.3 °C | 79.76 mm |
| December | -2.6 °C | 8.2 °C | 59.69 mm |
| Annual | 8.1 °C | 20 °C | 1180.34 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |