This DLC brings a new in-game weather system -- including snow, rain, and temperature changes. It also adds several new city maps, and introduces trams as a new public transportation option.
Potential buyers may expect that seasonal cycles are automatically included in this expansion, but that is not the case. Having snow in one's city is all-or-nothing. If a mayor wishes to get rid of their snow, they must start a new game entirely -- which means the regular $12.99 price tag is steep without offering the ability to change seasonal cycles.
Weather is your thing. And if you're okay with having an endless winter in your city. You should also pick this DLC up if you simply want trams as a transit option. That alone justifies the price for some players.