Metamora, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.1 °C (high). Annual precipitation averages 969.3 Millimeters. Metamora 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 | -9.2 °C | 0 °C | 54.36 mm |
| February | -7.4 °C | 2.6 °C | 50.55 mm |
| March | -2.1 °C | 9.4 °C | 65.53 mm |
| April | 4 °C | 16.7 °C | 95.5 mm |
| May | 10.5 °C | 22.7 °C | 118.87 mm |
| June | 15.9 °C | 27.7 °C | 109.98 mm |
| July | 17.8 °C | 29.5 °C | 95.5 mm |
| August | 16.5 °C | 28.4 °C | 90.68 mm |
| September | 12.1 °C | 25.6 °C | 88.39 mm |
| October | 5.7 °C | 18.3 °C | 78.49 mm |
| November | -0.7 °C | 9.9 °C | 68.33 mm |
| December | -6.1 °C | 2.9 °C | 53.09 mm |
| Annual | 4.8 °C | 16.1 °C | 969.27 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |