Norwood, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.1 °F (low) to 61.2 °F (high). Annual precipitation averages 39.3 Inches. Norwood is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.6 °F | 32.2 °F | 2.12 in. |
| February | 19.0 °F | 36.9 °F | 2.05 in. |
| March | 29.1 °F | 49.4 °F | 2.6 in. |
| April | 40.0 °F | 62.2 °F | 3.9 in. |
| May | 51.6 °F | 72.8 °F | 4.91 in. |
| June | 61.3 °F | 81.8 °F | 4.77 in. |
| July | 64.6 °F | 85.0 °F | 3.89 in. |
| August | 62.5 °F | 83.6 °F | 3.41 in. |
| September | 54.2 °F | 77.8 °F | 3.49 in. |
| October | 42.3 °F | 65.0 °F | 3.22 in. |
| November | 31.0 °F | 50.1 °F | 2.79 in. |
| December | 21.4 °F | 37.6 °F | 2.14 in. |
| Annual | 41.1 °F | 61.2 °F | 39.29 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |