Post-Mortem Changes and Environmental Factors

A 48-year-old male is discovered dead in a locked room in Bangalore during the monsoon season. The body is brought for autopsy 60 hours post-mortem. On examination, the forensic pathologist notes extensive skin slippage over the trunk and limbs, with a foul-smelling purulent discharge from the mouth and nose. The internal organs show advanced putrefaction with gas accumulation in the body cavities. Which of the following factors would have MOST significantly accelerated these post-mortem changes?