April 1970 - March 1972 Illinois Divisional Average Temperature Degrees Fahrenheit -99 1901-2000 base period 1901-2000 1101 Illinois CD 1. Northwest 48.5 71 48.2 0.3 1102 Illinois CD 2. Northeast 48.9 78 48.4 0.5 1103 Illinois CD 3. West 51.4 68 51.3 0.1 1104 Illinois CD 4. Central 51.3 85 50.7 0.6 1105 Illinois CD 5. East 51.0 88 50.3 0.7 1106 Illinois CD 6. West Southwest 53.6 82 53.1 0.5 1107 Illinois CD 7. East Southeast 53.6 83 53.1 0.5 1108 Illinois CD 8. Southwest 55.9 86 55.4 0.5 1109 Illinois CD 9. Southeast 55.9 83 55.5 0.4