The verdant greens of spring. The warm touch of summer sunlight. The vibrant oranges of a New England autumn. And the absolute hellhole that is Boston in winter. They're all here, in a new mod called the Fallout 4 Seasons Project.
Creator 'GameDuchess', who compiled the Project from many other mods, points to Chernobyl, Hiroshima, and Nagasaki as proof that nature reclaims irradiated spaces much quicker than humanity. Surely, 200 years after the bombs fell, Boston would have some greenery. Logic may not have much of a place in Fallout 4's uncredible world but hey, any excuse for more nature is dandy.
The only downside to the project at the moment is that seasons don't change automatically. You need to set your game to spring/summer/fall/winter manually. GameDuchess says it's a limit of the current tools, but that "The eventual goal after the Creation Kit is available is to build an optional mod from these packages that will switch seasons automatically."
I imagine it will be a great teaching tool for future generations once global warming has ushered in perpetual summer.