Snow near Saguaro National Park in Tucson on Jan. 2.
You never know what could happen, so be prepared. Make sure you have extra supplies with you at all times.
ADOT recommends a fully charged cell phone, drinking water and an emergency kit. You should also make sure your gas tank is filled.
And if it's snowing, it might be a good idea to have a coat and some blankets. Gloves are good, too.

