El Niño's effects vary widely across the U.S. In the Northeast, it can lead to unpredictable weather, with coastal areas experiencing rain or mixed precipitation and inland regions seeing heavy, wet snow, especially in January and February. The Southwest often faces increased rainfall, leading to muddy conditions and occasional cold snaps. The Deep South, including the Gulf Coast, may see colder-than-usual temperatures and frequent storms. Meanwhile, the Pacific Northwest might experience a less predictable snow season, and the northern Midwest could have drier winters with sporadic cold and snow.