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Illinois' ecology is in a land area of 56,400 square miles (146,000 km 2); the state is 385 miles (620 km) long and 218 miles (351 km) wide and is located between latitude: 36.9540° to 42.4951° N, and longitude: 87.3840° to 91.4244° W, [1] with primarily a humid continental climate.
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
The 2023 USDA plant hardiness zone map, which shows which areas of the country are suitable for growing plants and crops based on the lowest temperatures during the growing season.
However, the southern half of the state, from about Springfield southward, has a humid subtropical climate (Köppen Cfa) with winters becoming more moderate as one travels south. Average yearly precipitation for Illinois varies from 48 inches or 1,220 mm at the southern tip to 35 inches or 890 mm in the northern portion of the state.
In looking at the precipitation forecast for the next three months, much of the Southwest, Southern Rockies and Southern Plains are set to see well-below-average rain and snow accumulations.
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As for what a typical summer weather day is in Illinois, the University of Illinois state climatologist office says highs are usually in the 80s with lows in the 60s. Days above 90 degrees are ...
Köppen climate types of Illinois, using 1991-2020 climate normals. Illinois has a continental climate, with large temperature extremes not moderated by either mountains or oceans. Weather is influenced primarily by cold Canadian Arctic air in the winter, and warm, humid air from the Gulf of Mexico in the summer. High temperatures in the south ...