The phrase "same month" refers to a period of time that falls within the same calendar month. It means that two or more events, activities or occurrences happened during the same month, without specifying exact dates.
I have invested that money in under construction flat in gurgaon in same month of 2012. (relakhs.com)
Like for the year to year comparison, the present earnings of NT$ 3.57 billion or US$ 118.11 million is up by 9 percent though the earnings had been 33 percent higher for same month last year. (goodereader.com)