CHICAGO (CBS) -- Rain overnight brings a mild Tuesday. It only lasts briefly before January temps return.

Tonight:

Rain likely, especially after midnight. Low near 40.

Tomorrow:

Rain showers, especially in the morning. Warmer with a wide spread in highs (40s north of Chicago, to 60s south side of Chicago).

EXTENDED

Even after temperatures drop behind Tuesday night's cold front, the highs will still be warmer-than-average through the rest of the forecast.