Climate of Illinois
(United States)
Average daytime and nighttime temperatures
All climatic diagrams on this site result from the collected data from 14 measuring stations in Illinois.
All data correspond to the average monthly values of the last 20 years.
Back to overview: United States
The climate widely corresponds to Central European weather conditions. It is cold, wet and a few beautiful summer months are also happening during a year. Due to the warmer temperatures the best time for traveling is from May to September. Nearly unattractive for tourists are the cold months from November to March.
› Overview: Climate in the United States
› Duration of daylight and sunshine in the United States
› Overview: Climate in the United States
› Duration of daylight and sunshine in the United States
hours of sunshine per day
rainy days per month
Precipitation in mm/day
Relative humidity in %
Absolute humidity in g/m³ (approx.)
Climate charts for other states in the United States
Important cities in Illinois
Illinois is a part of the United States and has an east-west extension of about 330 km. From north to south it is approximately 600 km. The biggest cities are Chicago and Aurora. The local time is now Tuesday, 1:22 pm.| City | Population | Geo-Position | |
|---|---|---|---|
| Chicago | 2,679,044 | 41°51'0"N | 87°39'0"W |
| Aurora | 201,110 | 41°45'38"N | 88°19'12"W |
| Joliet | 148,262 | 41°31'31"N | 88°5'0"W |
| Rockford | 147,651 | 42°16'16"N | 89°5'38"W |
| Naperville | 147,122 | 41°47'9"N | 88°8'50"W |
| Springfield | 115,715 | 39°48'6"N | 89°38'37"W |
| Peoria | 114,265 | 40°41'37"N | 89°35'20"W |
| North Peoria | 113,004 | 40°43'3"N | 89°35'3"W |
| Elgin | 112,123 | 42°2'14"N | 88°16'52"W |
| Waukegan | 89,078 | 42°21'49"N | 87°50'41"W |
| Cicero | 83,891 | 41°50'44"N | 87°45'14"W |
| Champaign | 81,055 | 40°6'59"N | 88°14'36"W |
| Bloomington | 76,610 | 40°29'3"N | 88°59'37"W |
| Decatur | 76,122 | 39°50'25"N | 88°57'17"W |
| Arlington Heights | 75,101 | 42°5'18"N | 87°58'50"W |
| Evanston | 74,486 | 42°2'28"N | 87°41'24"W |
| Schaumburg | 74,227 | 42°2'0"N | 88°5'0"W |
| Bolingbrook | 73,366 | 41°41'55"N | 88°4'6"W |
| Palatine | 68,557 | 42°6'37"N | 88°2'3"W |
| Skokie | 64,784 | 42°2'0"N | 87°44'0"W |
| Des Plaines | 58,364 | 42°2'0"N | 87°53'0"W |
| Orland Park | 56,767 | 41°37'49"N | 87°51'14"W |
| Tinley Park | 56,703 | 41°34'24"N | 87°47'4"W |
| Oak Lawn | 56,690 | 41°42'39"N | 87°45'29"W |
| Berwyn | 56,657 | 41°51'2"N | 87°47'37"W |
| Mount Prospect | 54,167 | 42°3'59"N | 87°56'14"W |
| Wheaton | 52,894 | 41°51'58"N | 88°6'25"W |
| Normal | 52,497 | 40°30'51"N | 88°59'26"W |
| Hoffman Estates | 51,895 | 42°2'34"N | 88°4'47"W |
| Oak Park | 51,878 | 41°53'6"N | 87°47'4"W |
Data basis: German Weather Service, individual values averaged and supplemented by own elements.