India best October - March
Nepal best March - April & October - November
    SW China
(& Tibet)

best March - April & September - October, high summer for high altitude areas
. Laos Best: Nov-Feb [the cool, dry season with good festivals], OK: March-May [dry but very hot]. Worst: June-Oct
  Cambodia best December - February
Vietnam best all year round
  Thailand best Nov - March
Malaysia  best Feb - October
Maldives  best December - April, OK for travelling all year
  Sri Lanka best December - March (west & south), May - Sept (east)