I believe the tablelands in general don’t see much in the way of seasons. High Sun is likely to be a few degrees hotter and the day between Sun Descending and Sun Ascending is likely to be a few degrees cooler. I had a temp sheet I used to use that had High Sun see temps shooting up to 150 on the hottest days while Sun Descending and Sun Ascending usually topped out at 130.
For the Trembling Planes they have Coldnights, Flamesky, Fruitbirth, and Ral’s Rest. I haven’t seen Lost Cities of the Trembling Planes but I figured Coldnights was centered around the Sun’s lowest point, leading into Fruitbirth then Flamesky around the sun’s highest point going to Ral’s Rest which happens after the scorching heat sets fire to the prairie and smoke fills the air.
Other regions further north or south near the poles might see some snow that’s not just mountain tops.