Ice dam removal and roof snow removal are their own auctions in January
The winter keyword set has almost nothing in common with the summer one, and most roofing accounts never build it.
Between the first hard freeze and the last thaw the profitable searches change completely: ice dam removal, roof snow removal, emergency roof leak, attic leak, flat roof leak repair, emergency tarp. Different intent, different landing page, different price expectation.
Run them as a separate campaign that switches on by weather rather than by month. A warm week in January produces the same melt as a thaw in March, and the auction responds within hours.
Decide in advance whether you want ice dam work at all. Steaming is slow, skilled and often ends in a modest invoice. Plenty of roofers buy those clicks purely as an introduction to a spring re-roof conversation, which is a legitimate reason to pay for them as long as you track it that way.
The summer campaign covering tear-offs, flat roof replacement, gutters and flashing should not inherit winter bids or winter negatives.