Could This Weekend’s Low Temps Tie Or Break A Rockford Record?

We haven't even reached the first day of winter yet (Sunday, December 21st, 9:03am), but we've already gotten more snow in Rockford and the Rockford area than we got all of last winter. The winter of 2025 may end up being a record-setter when it comes to snowfall, but it's too early to tell. The same goes for records for cold weather.

As some super cold air settles across Northern Illinois this weekend, you should be bracing yourself for a frigid couple of nights. Forecasters are predicting temperatures dipping as low as -7 degrees Saturday night and -5 degrees Sunday night. There's no argument that temps like that are uncomfortable, but just how does that stack up against the deep‑freeze history of Rockford? Let’s break out the record books and find out.

Let's Get This Out Of The Way First: This Weekend's Temps Won't Even Be Close To Rockford's All-Time Low Temperature Record

According to the National Weather Service (NWS), the coldest temperature ever recorded in Rockford happened on January 31, 2019, when the mercury plunged all the way down to -31 degrees. Before that, some of the other Rockford “deep freeze” days saw temps drop to -27 degrees and lower during January winters.

So compared to that extreme, this weekend’s forecast is nowhere near breaking Rockford’s all‑time coldest mark.

What about the coldest December nights on record in Rockford? The NWS official “December daily records” show a wide spread, but there are some days in December where recorded lows dipped well below normal.

In terms of typical climate normal temperatures in December, Rockford’s average overnight low is usually about 20 degrees.

Bottom Line: The Weekend Will Be Crazy Cold, But Not Record-Setting (Or Even Tying)

A low of -7 or -5  would certainly register as a serious, bitter December cold snap, far below Rockford’s usual December overnight lows. Still, in the context of Rockford’s weather records, it wouldn’t tie or surpass any major low-temperature milestones, neither the all‑time record (-31) nor any known December daily‑record low that drops deep into the -20s.

It's going to be really cold, just not record-breaking cold.

I tried to find the record for number of swear words used by a Rockford resident to describe extremely cold weather, but came up empty.

Whatever low temperatures we reach over the weekend will never compare to this place: