Today Walgreen (NASDAQ:WBA)  announced its sales during the month of June jumped to $6.3 billion, an increase of 8.9% relative to last year.

Comparable-store sales also saw an impressive gain in June, as they rose by 7.5%, however Walgreen did recognize an increase of 1.7% thanks to a calendar shift of one additional Monday and one less Sunday in June of this year versus last year. However, it also recognized a negative impact of 0.9% thanks to the increased availability of generic drugs.

There was a wide bit of variability in sales increases in the different portions of Walgreen's business. Its front-end sales at stores open at least a year increased by just 1.3%, whereas its pharmacy sales at such stores skyrocketed by 11.3%, and its prescriptions filled grew by 7.3%. The shift of the calendar resulted in a positive gain of 2.6% to its pharmacy sales.

On the negative side of things, Walgreen noted its saw a decreased amount (2%) of customer traffic the front end of its stores open at least 12 months, however it did see the average transaction increase nicely by 3.3%.

In total, June marked another impressive month for Walgreen, as in total during the 10 months thus far in its 2014 fiscal year, its sales have increased by 6%, or $3.3 billion, to $63.7 billion over 2013 levels.