is there some sort of conversion chart that can work out X amount of inches of snow is equivalent to X amount of mm or inches of rain or the other way about? as a friend has been putting photos on facebook of her horses playing in almost 4 feet of snow in west virginia over the last 2 days, i wondered how much rain that would've been if just a few degrees warmer. i know it wouldn't be totally accurate as snow drifts but where i am in wales the rain also comes at you sideways