Fairview, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 61 °F (high). Annual precipitation averages 38.8 Inches. Fairview 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 | 14.7 °F | 31.9 °F | 1.88 in. |
| February | 18.1 °F | 36.6 °F | 1.94 in. |
| March | 28.4 °F | 49.2 °F | 2.49 in. |
| April | 39.0 °F | 62.2 °F | 3.84 in. |
| May | 51.2 °F | 72.8 °F | 5.09 in. |
| June | 60.9 °F | 81.6 °F | 4.7 in. |
| July | 64.0 °F | 84.7 °F | 4.06 in. |
| August | 61.7 °F | 83.2 °F | 3.53 in. |
| September | 53.5 °F | 77.5 °F | 3.66 in. |
| October | 41.8 °F | 64.9 °F | 2.97 in. |
| November | 30.3 °F | 49.8 °F | 2.58 in. |
| December | 20.5 °F | 37.1 °F | 2.04 in. |
| Annual | 40.3 °F | 61 °F | 38.78 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 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 |