It's not about whether it will snow or rain, it's about whether precipitation will be frozen or not, and all you need to know that, for precautionary reasons, is the temperature. It's not a large advantage of Celsius, but it is pervasive.
ETA: To be clear, I'm Canadian, and grew up with Celsius. Whether the temp was positive or negative was the second thing worth knowing after the actual number. It was a very practically useful bit of knowledge in everyday life, easily given and easily remembered.
ETA: To be clear, I'm Canadian, and grew up with Celsius. Whether the temp was positive or negative was the second thing worth knowing after the actual number. It was a very practically useful bit of knowledge in everyday life, easily given and easily remembered.