As a micro-example of how global warming impacts winters, consider lake effect.
Lake-effect snowstorms happen when winds (1) move across water and pick up moisture, (2) slow when they hit a shoreline, because the ground has more friction than water, (3) rise rapidly, because there’s no place else for those crowded, compacted air and water molecules to go, and (4) condense into storm clouds.
If a lake is frozen, there can be no lake effect. The wind doesn’t gather moisture from ice, just from water.
During recent years, the large lakes are freezing less often, later in the winter, and earlier during springtime. Thus, unfrozen lakes are generating more frequent, heavier snowstorms in their surrounding areas.