Sylvan Grove, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 19.6 °C (high). Annual precipitation averages 705.6 Millimeters. Sylvan Grove 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 | -7.7 °C | 5 °C | 15.75 mm |
| February | -6 °C | 7.7 °C | 22.35 mm |
| March | -0.8 °C | 13.8 °C | 36.32 mm |
| April | 4.4 °C | 19.3 °C | 58.67 mm |
| May | 10.8 °C | 24.6 °C | 111.25 mm |
| June | 16.9 °C | 30.7 °C | 93.47 mm |
| July | 19.6 °C | 33.7 °C | 108.46 mm |
| August | 18.4 °C | 32.3 °C | 97.03 mm |
| September | 13.4 °C | 27.9 °C | 59.44 mm |
| October | 6.1 °C | 21 °C | 49.28 mm |
| November | -0.9 °C | 12.9 °C | 27.94 mm |
| December | -5.9 °C | 6.2 °C | 25.65 mm |
| Annual | 5.7 °C | 19.6 °C | 705.61 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 |