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The spec of the standard Pirelli P7s we got are considered All Seasons... So they are "useable" down to -7C. I have read however that they are also sold in the summer variety.
I have been caught in a snow storm once in my RWD 325i with 18" summer's and managed to get home fine with careful driving.
As for the washer fluid, you can get a jug of fluid that is good for -40c (they're blue tinged)
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