Hopefully one day, all weather will be the standard on new cars instead of all seasons so accidents can be avoided.
IMO, all-weather tires are terrible in summer. They are also a compromise tire.
Noisier, more rolling resistance, poorer handling, less tire life.
It is not something that tire makers have adopted
All-weather tires have been around for over 15 years.
Nokian (Finnish tire company) was the 1st but now many tire manufacturers offer all-weather tires.
Nokian All-Weather tires offer excellent handling on wet or dry summer roads and superior grip in wintry conditions. Get the best of both roads with Nokian All-Weather tires’ safety and carefree driving comfort.
We have been using Nokian all-weather tires on our vehicles for over 12 years.
We only run these in the winter.
We run all-weather tires year round on all our company work vans.
For a tire to be designated "all-weather" it must have the snowflake symbol.
There is no magic here. All-weather tires are essentially a hard compound winter tire.
Not nearly as good as a soft compound true winter tire on snow and ice but way better than an all-season tire.
They last way longer than a soft compound winter tire.
Of course, some all-weather tires are better in the snow than others.
They can be used on summer pavement but not nearly as good as a true summer tire
Nokian tires have limited distribution in North America. They used to be excellent tires, pricey and made in Finland.
Now they are much cheaper in quality and cost and now made in Russia, and likely China in the future.