Seasons

Seasons in Thrae revolve around The Sunless Ring . Due to the powerful source of magical radiation from the center of thrae.
Annually, the magical radiations effect expands enough that it takes over more of the land. Sending both northern and southern lands into Winter. The center land also suffers from this winter, but not as badly due to how far they are from the Frozen Wastes.
Once the Magical cores power begins to recede, the once winter lands begin anew in Spring. Plant life that cannot survive the colder climates will begin to return to life as the world warms up.
When the Frozen core is in full slumber Thrae is at the height of its temperature gauges. Summer is the hottest seasons, and possibly the safest if someone did wish to venture far north or south into the Frozen wastes.
Though Fall sets in as soon as the Magic core begins to awaken again, to once more send the planet into a cold and bitter winter...with the cycle starting once again.