Found in today's Accuweather WeatherWhys® feature, accompanied by this explanation:
You will notice that snow melts quicker when the air is moist than when it is dry. Evaporation of any snow that melts when the air is dry readily cools the snow's surface, slowing the melting process. On the other hand, evaporation is slowed when the air is moist. The snow's surface cannot cool itself, causing melting to occur at a quicker rate.This is a bit counterintuitive for me, since I would have thought that dry air would lead to faster sublimation of snow - but perhaps above freezing the other principle dominates.
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