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The climate of Illinois (United States of America)
Illinois is one of the states located in the northern part of the United States of America. Illinois is one of the most densely populated states in the country. Illinois also has one of the best economies in the country. This is because many industrial regions can be found in Illinois as well as a lot of agriculture. Many raw materials can be found here as well such as petroleum, coal and wood. Illinois has a hilly landscape, its highest point is located at an altitude of only 376 meters above sea level. Illinois is located in the interior on Lake Michigan. The largest city in the state is located here which is Chicago. Illinois has a warm continental climate with much more erratic weather than you would expect. Long term average figures are only a guideline in which big fluctuations may be possible. During the winter it may get extremely cold with subzero temperatures during the day. During the summer temperatures may rise well above the average of 29-32 degrees Celsius (84-90 degrees Fahrenheit). Illinois is located in the so called Tornado Alley, a large area with a high risk of tropical storms and hurricanes. On average about 35 tornadoes can be recorded annually in Illinois. Although the number of tornadoes and the wind speeds they reach are not above average, tornadoes often cause more damage in Illinois than in other places. Because Illinois is densely populated chances of damage are higher.

Climate information of places in Illinois
The climate information given on this page is only brief. Specific information on weather and climate can be found on the pages per region or city. The following climate information is available for Illinois:

Climate information
Throughout Illinois several climate figures and temperatures can be recorded. The figures below are for Springfield and cannot be seen as an average for this state. For climate figures for other places and regions in Illinois please, visit the individual climate pages.

	average  maximum temperature (°C)	average minimum temperature (°C)	average hours of sunshine per day	average days with precipitation per month	average mm precipitation per month	average sea temperature (°C)
January	1	-10	5	9		n/a
February	3	-7	6	9		n/a
March	11	-1	6	12		n/a
April	18	6	8	11		n/a
May	24	11	9	11		n/a
June	29	16	10	9		n/a
July	31	19	10	9		n/a
August	29	17	9	8		n/a
September	26	13	8	9		n/a
October	20	7	7	8		n/a
November	11	1	5	10		n/a
December	3	-6	4	10		n/a
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm = 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate tables are useful but they don’t give an overall picture of the climate and possible weather conditions during a period of time. How high the chances are of hot or cold weather or hurricanes can often not be found in these tables. This is why we offer extra climate information per month. The figures below apply to Springfield. For climate figures on specific regions and places please, visit the relevant individual climate pages

	chance of (very) hot weather	chance of (very) cool weather	chance of long-term precipitation	chance of hurricanes (cyclones)	chance of sunny days	UV-index
January
February
March
April
May
June
July
August
September
October
November
December
click here for the explanation of the symbols

Disclaimer
The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.