(CNN)It may not be winter yet, but more than 20 million people are under some sort of winter weather watch, warning or advisory.
The early-season snow and ice storm spreads from the Southwest into the Midwest, according to CNN meteorologists. Snow was falling Monday from Arizona to Wisconsin, with freezing rain and sleet farther south into Texas and Oklahoma.
Albuquerque, New Mexico; Denver; Colorado Springs, Colorado; Amarillo, Texas; Oklahoma City, Wichita, Kansas; and Kansas City are under advisories or warnings, but in northern Colorado, the winter precipitation is helping to fight the wildfires in the state. Some areas of Colorado, and New Mexico, will see over 2 feet of snow.
The biggest concern in parts of Texas and Oklahoma is ice. Dangerous conditions with over a half an inch of accumulation could cause difficult travel conditions and power outages.