Wellington holds the title of the world's windiest city, with an average wind speed of 22.7mph. Wind-driven rain is fundamentally different from vertical rainfall — it strikes walls, window frames, and cladding at force, pushing moisture into building envelopes that were never designed to handle that kind of sustained lateral pressure

1,319mm of Annual Rainfall Driven Sideways

Wellington receives 1,319mm of rain per year. But unlike most cities where rain falls downward, Wellington's wind means a significant proportion of that rainfall hits your home horizontally. Standard roofing and guttering does nothing to protect against wind-driven rain penetrating walls and frames

Cold, Damp Winters That Chill Homes to the Core

Wellington's average winter temperature sits around 8°C to 11°C. Cold homes struggle to dry out. Moisture that enters during a southerly storm in June can still be sitting in your wall cavities in September. Cold air also holds less moisture, meaning when warm air from cooking or showering meets cold walls and windows, condensation forms rapidly and persistently

Cook Strait Funnelling Effect 

Cook Strait acts as a natural wind tunnel between the North and South Islands, amplifying wind speeds across the Wellington region. This funnelling effect means coastal and hillside suburbs like Island Bay, Karori, Hataitai, and Seatoun experience wind-driven moisture exposure that is significantly more intense than inland areas of comparable rainfall