CHICAGO (CBS) — Temperatures in Chicago will reach nearly 30 degrees above normal on Monday, with highs expected in the mid to upper 60s.

Some southern suburbs may even seen temperatures in the low 70s under cloudy skies, CBS 2’s Megan Glaros reports.

As of 11 a.m., the temperature was already 61 degrees at O’Hare International Airport.

Highs of 60s are pretty rare in Chicago in December: It’s only happened 71 times since records have been kept since the 1880s. Only twice has Chicago seen the 70s.

The mild weather won’t last too much longer however.

A cold front moves in tonight, bringing rain and a steady drop in temperature.

Chicago will still be enjoying a mild evening tonight, but by 8 a.m. on Tuesday it will only be in the mid 40s–much closer to the average high in the low 40s for this time of year.

A 20- to 30-degree drop isn’t so unusual for Chicago.

The biggest single day fall in temperature happened on Nov. 11-12, 1911 when Chicago enjoyed a high of 74 degrees, but endured a low of 13 degrees the next day.

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