Silvis, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 59.9 °F (high). Annual precipitation averages 38 Inches. Silvis is located in USDA Plant Hardiness Zone 5b. 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 | 14.1 °F | 30.2 °F | 1.54 in. |
| February | 17.7 °F | 34.8 °F | 1.75 in. |
| March | 28.3 °F | 47.7 °F | 2.53 in. |
| April | 39.4 °F | 61.0 °F | 3.67 in. |
| May | 51.3 °F | 72.2 °F | 4.84 in. |
| June | 61.3 °F | 81.4 °F | 4.84 in. |
| July | 65.0 °F | 84.5 °F | 4.29 in. |
| August | 62.8 °F | 82.6 °F | 3.97 in. |
| September | 54.6 °F | 76.7 °F | 3.47 in. |
| October | 42.7 °F | 63.8 °F | 2.86 in. |
| November | 30.7 °F | 48.7 °F | 2.26 in. |
| December | 20.3 °F | 35.7 °F | 2.02 in. |
| Annual | 40.7 °F | 59.9 °F | 38.04 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°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 |