Rarely does Dec. 31 bring the month's highest temperature -- it's happened only four times in 140 years of Chicago temperature records -- but Friday's forecast high of 55 degrees is expected to be this month's highest reading and would be the highest since 67 degrees on Nov. 22. It's a temperature more typical of the second week of April. Rain and even a few thunderstorms are likely to complete Friday's weather picture, but the scene changes abruptly Friday night as a fresh blast of cold air sends temperatures crashing 30 degrees into the middle 20s Saturday morning.
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