Naturally, as the other posters stated; summer tires stiff up in cold temps and thus resist traction notable. That said, as long as you're not planning on driving spirited on cold days and are confident that you're not going to get stuck out in bad weather, then it isn't so bad that you're not going to be able to get around just fine, it'll just reduce traction under hard accel/braking. If I had to throw out a guess, I'd say traction is reduce 30% under hard accel/braking.
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- Jake
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