Sales at B&Q were pummelled by the 'Beast from the East' in the first quarter as the DIY chain was forced to close stores in the face of extreme weather.
Figures from parent company Kingfisher show like-for-like sales in the three months to April 30 dropped 9%.
Total sales at B&Q in the period also fell by 8.8% to £828m.
The freezing weather hit footfall and sales in weather-related categories, and some outlets were forced to shut.
Kingfisher boss Veronique Laury also pointed to weak consumer demand as denting the firm's performance.
"It was a challenging start to the year, with exceptionally harsh weather across Europe and weak UK consumer demand," she said.
"This impacted footfall, especially sales of weather-related categories. February and March were particularly affected, with sales improving over the course of April and into May.
"Market conditions continue to be mixed. The UK is uncertain."