The ICSC-Goldman Sachs weekly tracking report indicated sales rose 0.2 percent in the week that ended Saturday.
Sales were up 3.2 percent from the same week of 2012.
The weekly retail survey found the week's shopping activity represented "catch up demand from the prior week," when unseasonably cool weather held back sales of spring items.
In the latest week, Weather Trends International Inc. said the national average temperature was 2 degrees Fahrenheit warmer than its historic average, helping promote spring merchandise.
The weather was uneven, however.
"The western half of the nation started the week off with summer-like [conditions], but a strong cold front moved onshore, bringing much cooler weather for the second half of the week," Weather Trends International said.
Senate Democrats to pull all-nighter on climate change
Jessica Simpson shares three-way kiss with friends in photo