The El Niño part of the ENSO typically gives Chicago warm, dry winters (relatively—it still gets cold and snowy here, just not as cold and snowy as usual).
Exhibit 1, a map of temperature anomalies in the Continental US for the first 12 days of December:
I'm about to leave the office to go home, where it's 8°C, after hitting 11°C at O'Hare a couple of hours ago. Tomorrow it might get warmer. And that's OK by me.