About Fossil Creek: Climate
Because of the differences in elevation found in the wilderness, the climate can be variable over the length of the day and varies greatly over the year. Summers will find the lower end hotter however, the upper stretches are pleasantly cool. In the winter, while the snow may cover the higher areas, the downstream sections can be moderately warm. In the spring, when the snow runoff flows the length of the canyon, the water temperature will be colder. The springs however, maintain a temperature of 72 degrees F all year. The canyon is subject to flash flooding at any time of the year. The danger is more prevalent during the summer and winter months, but any time the weather pattern indicates rain, always allow yourself enough time to exit the canyon before this becomes a problem.