Monsoon Season Impact on Indoor Mould Growth in Singapore Residential Properties
24-month longitudinal study reveals dramatic seasonal patterns in mould growth correlating with Singapore's monsoon cycles.
Pico X Health Research•May 2024•11 min read
Quick Answer
A 24-month study of 180 Singapore properties found indoor mould growth rises sharply during the Northeast monsoon (December–March), with reported cases roughly doubling versus the drier inter-monsoon months. The driver is sustained outdoor humidity combined with closed windows and heavier aircon use, not rainfall on its own. The practical takeaway is to treat and repaint before the monsoon window and to hold indoor RH at 45–55% through it.
This 24-month longitudinal study tracked mould growth patterns in 180 Singapore residential properties across multiple monsoon cycles. Northeast monsoon (Nov-Mar) showed 280% increase in new mould cases compared to inter-monsoon periods. Properties without dehumidification showed 4.2x higher mould incidence during peak monsoon months.