Rockford, Illinois, Average Temperature, April-February Degrees Fahrenheit 195202 47.5 195302 49.8 195402 50.8 195502 49.1 195602 50.0 195702 49.2 195802 48.1 195902 47.1 196002 49.3 196102 49.1 196202 47.1 196302 47.1 196402 50.5 196502 48.5 196602 49.1 196702 47.9 196802 47.1 196902 48.7 197002 47.0 197102 48.7 197202 49.9 197302 48.3 197402 49.4 197502 48.7 197602 49.6 197702 44.9 197802 47.9 197902 47.0 198002 47.8 198102 49.6 198202 47.7 198302 50.8 198402 49.0 198502 48.3 198602 48.3 198702 50.6 198802 50.0 198902 50.6 199002 48.9 199102 -99.0 199202 52.1 199302 47.8 199402 47.3 199502 50.3 199602 48.7 199702 47.7 199802 50.1 199902 52.1 200002 51.4 200102 48.4 200202 53.3 200302 49.7 200402 50.0 200502 50.6 200602 52.5 200702 50.4 200802 51.0 200902 48.9 201002 48.4 201102 -99.0 201202 52.5 201302 52.2 201402 47.3 201502 48.3 201602 52.9 201702 53.8 201802 50.6 201902 49.4