Palestine, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.7 °F (low) to 65.5 °F (high). Annual precipitation averages 45.2 Inches. Palestine is located in USDA Plant Hardiness Zone 6b. 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 | 22.1 °F | 38.3 °F | 3.1 in. |
| February | 25.1 °F | 43.2 °F | 2.42 in. |
| March | 33.7 °F | 54.0 °F | 3.5 in. |
| April | 44.2 °F | 66.4 °F | 5.09 in. |
| May | 54.9 °F | 76.5 °F | 4.79 in. |
| June | 63.6 °F | 84.9 °F | 4.95 in. |
| July | 66.2 °F | 87.9 °F | 4.25 in. |
| August | 64.1 °F | 87.0 °F | 3.16 in. |
| September | 56.3 °F | 81.5 °F | 3.43 in. |
| October | 44.8 °F | 69.3 °F | 3.65 in. |
| November | 34.5 °F | 54.5 °F | 3.71 in. |
| December | 26.7 °F | 42.7 °F | 3.16 in. |
| Annual | 44.7 °F | 65.5 °F | 45.21 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 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 |