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Here's a good site I found. It's from the NHTSA, so it should be unbiased and reliable. You can search for your brand of tires and find out the ratings for it (traction, temp, & treadwear)
http://www.nhtsa.dot.gov/cars/testing/UTQG/
http://www.nhtsa.dot.gov/cars/testing/UTQG/