Same store sales year-on-year growth slammed on the brakes and slowed by 1.0 percentage point to a 1.3 percent rate in the May 6 week, arresting the acceleration of recent weeks with the strongest readings since January 2016 and taking growth back down to the level last seen in the April 1 week. Some of the weekly and full month year-on-year comparisons in April, however, were probably skewed upward by Easter, which is usually led up to by a strong shopping period, coming as it did on April 16 this year versus March 27 last year. For the same reason, a distortion in favor of April was probably also partly at play in the month-to-date same store sales versus April, which were down 1.6 percent, the steepest drop since January. Full month year-on-year sales were also just 1.3 percent higher, down 0.7 percentage points from the prior week and the smallest gain since the week of March 25. But behind the sudden slowdown of what had appeared as the strongest gain acceleration in a year for retailers in Redbook's sample was mainly unseasonably cold temperatures in many parts of the country, and Mother Nature could put a damper on this Mother's Day sales week as well.