Badly sorted data exported from access

I pull off reports from access and export them to excel, they appear in the format (not the data i pull off, just an example) below and i have to manually fill in all the blanks, does anyone have an idea on how to automate this?

How it looks;

Month Date
Jan 1
2
3
4
5
Feb 1
2
3
4
5

How it should look;

Month Date
Jan 1
Jan 2
Jan 3
Jan 4
Jan 5
Feb 1
Feb 2
Feb 3
Feb 4
Feb 5