Imported retail container traffic is anticipated to be flat this winter compared to the same time last year, suggesting many retailers aren't expecting big sales through the first few months of the year.

According to a new report released Thursday by the National Retail Federation and Hackett Associates, U.S. ports are expected to handle approximately 1.21 million 20-foot Equivalent Units, up by 0.1 percent. February is expected to be the slowest month of the year at 1.06 million TEU.

However, this spring is projected to see significant year-over-year improvements, with double-digit improvements beginning in March.

"We're headed into the slow season for cargo shipments, but forecasts indicate that retailers will be stocking up this spring in anticipation of a moderate recovery as the year progresses," NRF vice president for supply chain and customs policy Jonathan Gold said.

It's important to note that while cargo imports don't translate directly into sales, when retail merchants expect surges of activity, they tend to order more product to take advantage of the situation.