The longer you wait, the more likely it is you'll be facing expensive repairs as water gets to your roof sheathing, framing, attic insulation, etc. In your climate, I suspect melting snow will cause more damage than just rain. I've never believed in temporary or partial fixes, unless warranted by unique circumstances. Your new roof will require a complete tear-off of the old one, and you might consider using a more durable shingle this time around (40-year, or even 50-year).
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