Dry is the opposite of humid. Mummification is more likely in a dry environment than a humid. Depending on the circumstances, cold weather could be much more conducive to mummification than warm temperatures ... Yeah, cold and dry. Brings to mind that 500 year old Incan chick found mummified at the summit of an Andean volcano. Sufficiently well preserved to catch the fancy of a former president! His press secretary noted that she compared favorably to the mummy he married.
May be Clinton's charming mummy is ALGORE MORTIS in disguise.