New York's retailers are giving a grade of "B-minus" for the 2013 holiday shopping season.

That's according to a survey by the Retail Council of New York State.

The council says merchants saw an increase in sales of 3 to  4% over a similar time period last year.

Retailers surveyed said the bulk of shopping took place in the five or six days running up to Christmas, while post-Christmas sales were very strong.