Like-for-like sales in June were 1.8% higher than in June 2006, when they had risen 3.8%. Total sales in June were 6.0% up on a year ago.
June's like-for-like sales were the weakest since March 2006 when sales fell slightly because Easter was in April in 2006 but in March in 2005.
The cold wet weather hit food, clothing, footwear, food, gardening and outdoor DIY. Indoor homewares picked up a little especially in clearance sales and beauty products also strengthened.
Scotland's performance in June fell below that across the UK, which saw 3.0% like-for-like growth.