Help With SUMIFS by Month

I have a table where I want to the columns to be auto totaled by month.

I am pretty much a giant excel noob, I could probably use a pivot table, but I would rather use a normal table with an excel formula.

The goal of this spreadsheet is to track the number of "social" mentions for a given keyword.

For instance I have a table called, "Total_Mentions" made of 5 columns, Date, Month, Keyword 1, Keyword 2, Keyword 3.

I would like to be able to have a 2nd table with 4 columns, month, keyword 1, keyword 2, keyword 3 that has rows populated with the sum of all keyword mentions for the given month.

The purpose of these two tables is to make a line graph of the mentions by day, and then make a pie chart comparing the "relative share" of mentions for the given month. ie Keyword 1 had 50% a share of mentions, Keyword 2 had 25%, and Keyword 3 had a 25% share of mentions

Please help!