The most important factor to consider in wet weather traction is tread depth. Even though their tires are not legally worn out, many drivers don't realize they may be below adequate tread depth to properly function in wet weather conditions. A tire is officially worn out when it reaches 2/32" of remaining tread depth, but after 4/32" of remaining tread depth your tires are recommended for dry roads only.
Hydroplaning occurs when a wedge of water lifts the tire from the road, creating a potentially dangerous situation. Hydroplaning is most frequent with heavy rain or high speed in wet conditions. It's the tires job to evacuate water quickly and efficiently to maintain contact with the road at all times. If your tires don't have sufficient tread depth the channels that evacuate water from underneath the tread will not be large enough to resist the wedge of water from building.
The tread design itself also plays an important role in wet weather traction. The directional tread design, also known as unidirectional tread, is one of the most efficient designs for water evacuation. Most directional tires have a V-shape tread pattern which can more easily push water from underneath the tire when compared to a typical ribbed tread design.
Bridgestone Potenza RE970AS Pole Position
Goodyear Assurance TripleTred All-Season
If you're looking for a safer wet-weather driving tire for your performance sedan or coupe, like a BMW 3 Series, the Bridgestone Potenza RE970AS Pole Position is my choice. If you have a touring sedan like the Toyota Camry I would recommend the Goodyear Assurance TripleTred All-Season, while the Yokohama Parada Spec-X would be a preferred choice for an SUV like the Ford Edge.
Shop by vehicle to find the tire that'll be best in wet weather conditions for your vehicle.