The forecast maximum temperature at Dixon, Illinois for Wednesday is -18F.
If the forecast is accurate, that would be the coldest afternoon on record at Dixon since 1895. The previous record of -14 F was set on Christmas Day, 1983 and January 19, 1994.
The two previous records were aided by volcanic dust blocking sunlight from the eruptions of El Chichón in 1982 and Mt. Pinatubo in 1991. After those eruptions, temperatures spiked in the stratosphere, and cooled in the troposphere. Note that all five of the previous coldest days were set during the last 35 years.
In the real world outside the ivory towers of academia, journalism and politics, the Arctic is very cold, and the cold air is spilling to lower latitudes.