WASHINGTON — U.S. shoppers spent cautiously this holiday season, a disappointment for retailers who slashed prices to lure people into stores and now must hope for a post-Christmas burst of spending.

Sales of electronics, clothing, jewelry and home goods in the two months before Christmas increased 0.7 percent compared with last year, according to the MasterCard Advisors SpendingPulse report.

That was below the healthy 3 to 4 percent growth analysts had expected — and it was the worst year-over-year performance since 2008, when spending shrank sharply during the Great Recession. In 2011, retail sales climbed 4 to 5 percent during November and December, according to ShopperTrak.

This year’s shopping season was marred by bad weather and rising uncertainty about the economy in the face of possible tax hikes and spending cuts early next year. Some analysts say the massacre of schoolchildren in Newtown, Conn., earlier this month may also have chipped away at shoppers’ enthusiasm.

Retailers still have time to make up lost ground. The final week of December accounts for about 15 percent of the month’s sales, said Michael McNamara, vice president for research and analysis at MasterCard Advisors SpendingPulse.

Still, this season’s weak sales could have repercussions for 2013, McNamara said. Retailers will make fewer orders to restock their shelves, and discounts will hurt their profitability. Wholesalers will buy fewer goods and orders to factories will likely drop in the coming months.

Steep discounts weren’t enough to get people into stores, said Marshal Cohen, chief analyst at the market research firm NPD.