Chemung, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.3 °C (low) to 14.2 °C (high). Annual precipitation averages 959.1 Millimeters. Chemung is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.6 °C | -1.8 °C | 42.93 mm |
| February | -9 °C | 0.4 °C | 43.43 mm |
| March | -3.6 °C | 6.9 °C | 56.64 mm |
| April | 2.2 °C | 14.2 °C | 93.22 mm |
| May | 8.6 °C | 20.7 °C | 112.52 mm |
| June | 14.1 °C | 26.1 °C | 131.57 mm |
| July | 16.3 °C | 28.1 °C | 99.06 mm |
| August | 15.3 °C | 27.2 °C | 102.87 mm |
| September | 10.9 °C | 23.6 °C | 92.71 mm |
| October | 4.5 °C | 16.3 °C | 73.41 mm |
| November | -1.4 °C | 8.1 °C | 60.45 mm |
| December | -7.2 °C | 1.1 °C | 50.29 mm |
| Annual | 3.3 °C | 14.2 °C | 959.1 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |