Here are a few examples from the settings:
At one time, it is probable that Amn, Tethyr, the Vilhon Reach, Chessenta, Unther, and Mulhorand were tropical or subtropical, on Toril.
But then the Frozenfar became the Frozenfar (the northern one-quarter of the Faerunian continent gained an icecap) and the climate further south cooled dramatically. Then the Great Glacier, a product of magic, chilled things down even further.
If the magic being used to prop up the climate in the Flanaess, on Oerth, were to be halted, the climate of the Amedio Jungle, Hold of the Sea Princes, Olman Isles, Tilvanot Peninsula, Great Swamp, and northern Hempmonaland would revert to temperate. The frigid blasts from Hyperboria, the freezing of the ocean between it and the Flanaess, the continental effect of the Flanaess, and the high axial tilt of Oerth (30 degrees) would send great waves of cold Equatorward during the winter.
There is evidence that Oerth was in an Ice Age during the time of the Suloise Imperium and Baklunish Empire. Consider the hot, dry climates of those areas now.
On Ansalon, on Krynn, the climate of most of the continent was tropical or subtropical prior to the Cataclysm.
The Cataclysm created an ice cap over the South Pole, which grew northward until it touched Ansalon, and gave the southern part of the continent a subarctic climate.
In Northern Ergoth, Solamnia, Estwilde, the Khalkist Mountains, Khur, and to some extent (a very cold extent) Qualinesti, Silvanesti, and Southern Ergoth, the climate became temperate.