"Climate and tire wear
Water acts as a lubricant. Tires that often travel over wet pavements can show up to 30 percent longer treadwear than tires that run only on dry pavements. Temperature is also a factor. When the temperature increases, so do treadwear rates. For example, when roads are wet, fleets typically obtain better tread-weari n the fall and winter verses spring and summer.
Driving technique plays a major role in maximizing tire life, but so does where the vehicle is driven."
This is one reason we get so many different opinions regarding a tire brand, and tire ware.. One person, living in a cold area, may get 60K and another living in a hot area 30K.
Here in AZ we can count on about 30% less tread ware, and recommendations are replacing tires every four year.