In Snowfall, the difficulty heats up when the city cools down, thanks to a new in-game temperature reading that will have residents bundling up for warmth when the weather outside is frightful. Cosmetic weather, composed of rain and fog, will be added to Cities: Skylines as part of a free update.

Players who own Snowfall will get to face new challenges such as ensuring that their city infrastructure can handle seasonal heating demands – and, when the snow starts falling, that the roads can stay clear. New snowplow services will be required to prevent traffic from freezing in place, while new all-weather trams and expanded public transit options can help residents and visitors alike get around town – and visit the new winter parks and landmarks available in Snowfall.