The agency says it was the second decrease in three months after a general upward trend that began last May.
In volume terms, wholesale sales were down one per cent in January.
Six of the seven subsectors, representing almost all wholesale sales, posted decreases in January.
Most of the decline came in the automotive and miscellaneous subsectors, where sales fell 3.0 per cent.
Miscellaneous wholesalers reported a drop of 2.5 per cent, with much of the decline coming in sales of agricultural supplies.
Wholesale sales declined in six provinces in January, with most of the decreases in central and western Canada.