It varies with the campaign but there's been a lot of jungle action in both my long-running (since 2000) Freeport and (one-year old) Pirates campaigns. Lands of Intrigue has been very city-focused although part of it was set in the fey and wolfen-inhabited Forest of Tethyr. The Pirates campaign is also largely based at sea (doh!) and has involved volcanoes and a swamp.
Our present campaign is set in Ptolus, and prior to it, the Seven Spires involved temperate climates and urban areas (Laelith). I voter both "temperate" and "urban".
The campaign I currently DM is mostly planehopping. Prior to that the party spent a large amount of time in desert and jungle regions.
In the campaign in which I'm a player, we're currently in the Underdark. Prior to that, we did a fair share of plane-hopping and had to visit urban and wasteland regions of the Material Plane.
Overall, we're rarely in a temperate medieval environment, and rarely in towns for any longer than it takes to buy and sell and get quests.
In Creation Schema we have have been in a jungle for a bit now. During the course of the adventure we have done Urban, desert, plaind/forest, artic, aquatic, dungeons, underground, planar and some mountains.