I am not familiar with this situation as I drive my Box year round. But I would think that it would make sense to wait until you get warmer weather before you start it. +15C/59F or higher and don't put the top down too soon as it would be too brittle(rear window) until it is good and warm.
No revving above 3000 rpm until water temp is 80C plus(center of guage). Warm it up slowly. Finally got some dry roads here to open her up and another month can take the snow tires off.
G.
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