Focusing on my area and the American models: GFS keeps temps right at freezing during the icing event before temps drop and sleet occurs. Due to marginal temps and heavier rates, I think quite a bit of freezing rain would runoff and lower accretion.
NAM and 3k NAM keep me around 30 during the icing portion of the event, increasing accretion.
Winds will be an issue if any significant icing should occur. I’m 24 hours away from breaking out the “ice accumulation index chart”.