Changing values with another value

Jan 7 2015 3:39 PM

Hi,
I have a simple query that getting some datas like below;

ID , Month
1       5
2       12
3        3

For example I want to change "Month" column's value. For example if there is 1, and I'll show with January. And if there is 12, I'll show December.

How can I do that with MSSQL?

Regards.