Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_36559 ( "Week" real, "Date" text, "Opponent" text, "Result" text, "Attendance" real )

### Question ###
What was the average week for the gaime against the philadelphia eagles with less than 31,066 in attendance?

### Accurate SQL ###

SELECT AVG("Week") FROM table_36559 WHERE "Opponent" = 'philadelphia eagles' AND "Attendance" < '31,066'