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Köppen climate types of Illinois (with counties overlaid), using 1991-2020 climate normals. The Climate of Illinois describes the weather conditions, and extremes, noted within the state of Illinois, United States, over time. Because of its nearly 400-mile (640 km) length and mid-continental location, Illinois has a widely varying climate.
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.
Temperatures in Illinois are projected to rise over the course of the 21st century. The amount of increase depends on how much humans curtail their CO 2 emissions. If humans continue to emit at current levels, the increase will be between 8 and 14 °F (4.4 and 7.8 °C). If emissions are lowered, the rise will be between 4 and 9 °F (2.2 and 5 °C).
A third letter can be included to indicate temperature. Here, h signifies low-latitude climates (average annual temperature above 18 °C (64.4 °F)) while k signifies middle-latitude climates (average annual temperature less than 18 °C). In addition, n is used to denote a climate characterized by frequent fog and H for high altitudes. [14] [15 ...
The area could also face a wild swing in temperatures with Tuesday's high near 80 and Wednesday's high in the mid-30s. ... 2024 at 9:33 AM ... Wild weather pattern expected for central Illinois ...
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 of the state are about 10 to 12 °F. warmer than the north.
Places with more than three months of average daily temperatures above 10 °C (50 °F) and a coldest month temperature below −3 °C (27 °F) and which do not meet the criteria for an arid or semi-arid climate, are classified as continental. Most climates in this zone are found from 35 latitude to 55 latitude, mostly in the northern hemisphere.