You can find more information here . We travel through Montana, Wyoming, Colorado at least twice a year. Some AAA club sites have more timely information from local authorities than do others. The Travel Industry of America says family road travel will be up this winter. You can find more information here .
Annual replacement is probably a good idea.
Extremes of hot or cold degrade rubber components. If you live in an area where either extreme is common you will need to replace your blades more frequently. As stated earlier, clearing your vehicle of snow and ice will increase visibility, but it also will decrease weight and increases fuel economy. The most important way to conserve energy is to consolidate trips and errands. When the weather is bad, this also limits your exposure to potentially hazardous traffic conditions.