As arches resides in a desert there is not a lot to retain the heat from the day. In the summer the temperature can sore over 100 F at mid day, however at night the temperature plummets towards freezing. Not many people realize that Arches can get some fairly strong snow storms.
Although arches is a desert the most dangerous weather here is water. Flash floods are due to thunder storms that can be miles away. The earth around arches is scared with small gullies that run for miles many hikers have been walking through these canyons on perfectly sunny days when out of no were a wall of water is bearing down on them. Flash floods are unpredictable at best you might know they are coming just a few seconds before it arrives. Notice in the picture below the flat lands are flooding but there is no rain and the clouds above aren't major storm clouds. Arches my gets quite a few thunder storms a year, however most precipitation will fall in a single storm making flooding a serious danger.
