Snow is an image that often relates to purity. This both comes from it color - white - and the colloquial phrase "as pure as the clean driven snow". If you consider that snow blankets the ground, it could also be viewed (in either a positive or negative way) as hiding or covering something. Consider that when snow melts it turns to water and the symbol could in some cases relate to a way of receiving the Word of God or the Spirit(which are often represented by water).
* Symbol meanings provided by www.mydreamstories.com should not be used as a dream dictionary. They are for reference only and both dreamer and interpreter should be careful to listen to the voice of Holy Spirit as to what any particular symbol means in any specific dream