It’s certainly not as efficient, but it can still be ugly when the antecedent conditions leading in are pretty cold. A lot of the surfaces will remain solidly below freezing despite air temp being at freezing. Urban areas will have a harder time with accretion, but out to the north and west, it’s probably closer to 30 and really ugly
Yeap. 0.03" of ice actually managed to accrete on tree branches at 32F with light rain/drizzle IMBY through the afternoon and evening following the nearly 5" of snow earlier in the day. This was the February 20th, 2019 event.