The picture you see above has been extracted form the Southern Regional Climate Center at LSU. Please go towww.srcc.lsu.edu to verify. File picture made 05/31/13 at 09:30
Commentary: Yes, this is for just May alone and does not factor in the other 11 months of the year. I have yet to find any suggestion that the trends for the month of May are different from the other months, so it seems plausible that the trend would be somewhat similar for the remaining 11 months.