Originally Posted by jamawani

The rim at Bryce Canyon is between 8000 and 9000 ft.
The valley at Zion is at 3666 ft. Big difference.
On average that would be a 15F temp difference.
With uplift and incoming fronts, maybe 20F.

From the Western Regional Climate Center -
Bryce Canyon (Oct) - Avg Hi - 60F, Avg Lo - 26F
Zion N.P. (Oct) - Avg Hi - 78F, Avg Lo - 49F

So you can have snow in the morning and bake in the afternoon.

Utah