The river never ices up, even during the coldest months of winter. The area doesn't get much snow and it generally melts quickly when a storm does come through. On most winter days the temperature will reach the mid 40s. Nighttime temperatures during the winter are in the 20s. Summertime highs reach the 90s with nighttime temperatures dipping down into the mid 50s.
Water flows vary greatly on the river.
During the winter the flows drop as low as 600 cubic feet per second. The most popular months on the river are September, October, and November, but the river is always crowded. As far as hatches go, midges hatch all year long. Mayflies and Blue Wing Olives hatch in the spring and fall and Pale Morning Dunns hatch during the summer. Caddis hatch during the summer and fall.