The Scout API, by T3, enables 3rd parties to take advantage of the context the company brings to advertising. Added to location sensitivity, which has been employed by the likes of Walgreens and others geofencing their stores, Scout brings weather, time, speed and orientation. Scout joins a list of 274 advertising APIs in our directory. Public documentation is unavailable; interested developers can contact firstname.lastname@example.org.
Popular weather data site Weather Underground (Wunderground) has a new version of its Weather Underground API and two things are notable: its former XML service is being phased out in favor of JSON. And it has a very clear pricing structure, though there's a free version for non-commercial projects.