Sailor Springs, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.2 °F (low) to 65.5 °F (high). Annual precipitation averages 45.8 Inches. Sailor Springs is located in USDA Plant Hardiness Zone 6b. 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 | 22.7 °F | 38.7 °F | 3.24 in. |
| February | 25.6 °F | 43.4 °F | 2.53 in. |
| March | 34.3 °F | 54.2 °F | 3.71 in. |
| April | 44.6 °F | 66.4 °F | 4.9 in. |
| May | 55.3 °F | 76.0 °F | 5.02 in. |
| June | 64.1 °F | 84.7 °F | 4.89 in. |
| July | 66.7 °F | 87.5 °F | 4.19 in. |
| August | 64.3 °F | 86.6 °F | 3.39 in. |
| September | 56.6 °F | 81.2 °F | 3.3 in. |
| October | 45.5 °F | 69.5 °F | 3.48 in. |
| November | 35.1 °F | 54.6 °F | 3.98 in. |
| December | 27.3 °F | 43.0 °F | 3.12 in. |
| Annual | 45.2 °F | 65.5 °F | 45.75 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |