Source: www.WXcharts.com As December 2025 unfolds, the U.S. weather pattern feels familiar—but not identical—to what we experienced in January 2025. The same climate “players” are on the field, yet their alignment is subtly different, shifting the balance between warmth and cold. Below is a side-by-side snapshot of the key atmospheric drivers. Climate Indices: Then vs. Now ENSO • Mid-Dec 2025: Weak La Niña continues • Jan 2025: La Niña firmly in place Arctic Oscillation (AO)