Sunrise and sunset as part of the weather
One use case for Weather is to make plans for outdoor activities, as those may heavily depend on weather conditions. One thing that would be useful to include in these designs is another semi related data, which is sunset and sunrise times. Especially here in the nordics during the darker months, the time of sunset/sunrise changes constantly and greatly effects how one makes plans.
I imagine it'd be useful both for a "todays summary" kind of view, and for each day in a 10 days weather forecast too.