This sentence means that when the snowflakes fall to the ground, we look forward to the arrival of the year of peace.
"As the snow falls and frost grows, a safe year will come" is a poem that expresses people's prayers and expectations for peace and a better future. "Snowfall" and "frost bloom" are both beautiful scenes depicting winter. These scenes are often used to symbolize the passage of time and the change of seasons. "Sui" refers to time or year, which represents people's expectations and wishes for the future at this moment.
In this sentence, "May you have a peaceful year" expresses people's common wish, hoping that the future will be safe and smooth, and everything will go as they wish.