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Roll stiffness is the main factor for winter conditions (or rain).
Selection of roll bar rate is probably more important than spring rate, per se.
Adjustable roll bars where you can increase the lever arm for winter and decrease it for summer might be helpful (roll stiffness depends on bar diameter, hollow or solid and length of the lever arm.)
If you use roll bar rates to compensate for winter the other advantage is the two wheel jounce rate is lower than if you rely on spring rate.
Ideally for winter you want to find coilovers with around the same spring rate as stock, adjustable damper rate in rebound so you can reduce the stiffness of the damper for winter (by a click or two is all, probably, you need a certain rate for any given spring rate) and adjustable spring perches which together with adjustable roll bars to up the spring rates in roll for summer or track use will suit you.
I learned all this from a coilovered Audi S4 (Stasis track sports) which was truly awful in winter but a hoot and a half in summer. The only adjustments were ride height and rebound rates. Adjustable roll bars with lower rate springs would have been more flexible and suitable for winter or wet road use.
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