Metropolis, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.7 °F (low) to 67.9 °F (high). Annual precipitation averages 51.1 Inches. Metropolis 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 | 26.3 °F | 43.1 °F | 4.19 in. |
| February | 29.3 °F | 47.7 °F | 3.52 in. |
| March | 37.3 °F | 57.6 °F | 4.77 in. |
| April | 47.0 °F | 69.1 °F | 5.12 in. |
| May | 57.2 °F | 77.6 °F | 5.31 in. |
| June | 65.8 °F | 85.7 °F | 4.77 in. |
| July | 69.2 °F | 88.8 °F | 4.01 in. |
| August | 67.0 °F | 87.7 °F | 3.04 in. |
| September | 59.2 °F | 81.9 °F | 3.59 in. |
| October | 47.5 °F | 71.0 °F | 3.9 in. |
| November | 37.0 °F | 57.5 °F | 4.32 in. |
| December | 29.9 °F | 46.7 °F | 4.6 in. |
| Annual | 47.7 °F | 67.9 °F | 51.14 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |