Marine, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.9 °C (low) to 18.7 °C (high). Annual precipitation averages 1124.2 Millimeters. Marine 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 | -5.2 °C | 3.9 °C | 69.09 mm |
| February | -3.4 °C | 6.8 °C | 60.45 mm |
| March | 1.6 °C | 12.6 °C | 86.11 mm |
| April | 7.4 °C | 19.2 °C | 125.22 mm |
| May | 13.5 °C | 24.3 °C | 129.54 mm |
| June | 18.4 °C | 29.2 °C | 120.14 mm |
| July | 20.4 °C | 31.1 °C | 107.95 mm |
| August | 19.3 °C | 30.4 °C | 93.47 mm |
| September | 14.6 °C | 26.9 °C | 83.57 mm |
| October | 8.2 °C | 20.5 °C | 84.33 mm |
| November | 2.1 °C | 12.6 °C | 93.73 mm |
| December | -2.7 °C | 6.4 °C | 70.61 mm |
| Annual | 7.9 °C | 18.7 °C | 1124.21 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 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 |