=INDEX(Table 1::$A:$G,MATCH(B2,Table 1::$A,0),MATCH(B1,Table 1::$1:$1,0))
or
=INDEX(Table 1::$1:$7,MATCH(B2,Table 1::$A,0),MATCH(B1,Table 1::$1:$1,0))
Which one you use depends on which way your table might expand in the future. You probably want the first one.
The first formula uses the range Table 1::A:G to reference the entire table. I assume you will be adding more columns for the rest of the months so the "G" will actually be "M" for your complete table. With Table 1::A:M you can add more rows to Table 1 and you can add new columns between A and M without having to edit the formula. They will automatically be included. If you add new columns to the left or right, the formula will have to be edited to include them.
The second uses Table1::1:7 to reference the entire table. With this one you can add new columns and they will automatically be included in the formula and you can add new rows between 1 and 7 but you cannot add new rows above 1 or below 7 without editing the formula to include them.