Norris City, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46 °F (low) to 66.5 °F (high). Annual precipitation averages 46.6 Inches. Norris City 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.3 °F | 40.6 °F | 3.53 in. |
| February | 26.8 °F | 45.7 °F | 2.99 in. |
| March | 35.1 °F | 55.5 °F | 4.21 in. |
| April | 45.2 °F | 67.3 °F | 5.01 in. |
| May | 55.8 °F | 76.5 °F | 5.16 in. |
| June | 64.5 °F | 85.0 °F | 4.47 in. |
| July | 67.5 °F | 87.8 °F | 4.01 in. |
| August | 65.2 °F | 87.0 °F | 3.05 in. |
| September | 57.5 °F | 81.7 °F | 3.17 in. |
| October | 45.8 °F | 69.9 °F | 3.4 in. |
| November | 35.7 °F | 56.0 °F | 4.01 in. |
| December | 28.1 °F | 45.0 °F | 3.62 in. |
| Annual | 46 °F | 66.5 °F | 46.63 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |