Most people assume that winter sets in December. But real winter in India sets only in the middle of January. This little known fact makes the last week of December wonderful for trekking. The snow is not thick enough to prevent trekking, but the all-white landscape is perfect for a winter trek. Arjun Majumdar lists the Top 5 winter treks to do in India. Time yourself for the last week of December for most of them, though some can be done in Jan and Feb.