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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.
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.
The USDA released a new hardiness zone map and half of the country has shifted. ... according to data collected by over 13,000 weather stations across the U.S. The good news is the USDA has ...
The climate is generally cooler with slightly less annual precipitation than in southern glaciated regions. Cropland agriculture, especially corn, is common, and there is more irrigated agriculture and pastureland, but fewer scattered woodlands than in neighboring Western Corn Belt Plains (47) regions.
Historically, average snowfall ranges from about 10 inches (25.4 cm) in southern Illinois to 40 inches (100 cm) in northern Illinois. The change in annual snowfall amounts show no trends at all, with years being higher or lower than average. However, the season when snow is likely to fall has shrunk by about two weeks since the late 1970s. [5]
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 ...