Via The Washington Post, Climate Central reports that winters have gotten significantly warmer in the US, especially in the Great Lakes and Northeast regions:
[W]inter in the United States is warming faster than any other season. Since 1970, average winter temperatures have increased [0.6°C] or more in every state, while 70 percent have seen increases of at least [1.7°C].
Other studies have shown the length of winter season shrinking globally as well. From 1952 to 2011, winter shrank by at least 2.1 days per decade on average. By 2100, winter could be less than two months and could start a half-month later.
Changes in the blooms of fruits and plants can affect other links in the food chain. For instance, many migratory birds travel north according to the movement of the sun. If plants bloom earlier or insects move because higher temperatures occur earlier, the birds may arrive when most of their food is no longer abundant.
Across the eastern United States, Climate Central found that cold weather still will occur in the coming decades, although cold snaps have become shorter and less frequent recently.
In Chicago, we've seen a full 2°C rise in temperatures in my lifetime:
In case the raw statistics don't get you to notice climate change, Climate Central also has an interactive map where you can raise sea level a bit and watch your favorite cities disappear. At 1.5 meters, for example, my old place in Hoboken, N.J., pokes out of a shallow lagoon. At 5 meters, we no longer care about Florida.