The distribution of snowfall amounts is best described as skewed (if there are more days with low snowfall and only a few days with high snowfall) or uniform (if the snowfall amounts are evenly distributed). So, the range is a more appropriate measure of variation than the mean (if there are outliers influencing the average snowfall).
You can adjust the terms "skewed" or "uniform" depending on the actual shape of the distribution shown in the line plot.