After several years of weber covers lasting a year in Colorado, I actually gave up on them. They are not cheap, and they have never held up for me. I switched to this collection, and They are much heavier to stand up to wind, rain, and snow
Look for: "Classic Accessories 55-411-011501-00 Veranda Grill Cover For The Weber Performer" on Amazon, and from there you should see their whole line of covers.
That's all that I can recommend. I did just get a small shed this year to solve the problem completely, but these have worked for me.
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