what is the average returns of the sandp 500 for each month

The S&P 500 (GSPC) had its best month since December 30, 1927 in August 1932, returning 37.3%.

ASSET MONTH % RETURN
the S&P 500 (GSPC)
December 1927
0%
the S&P 500 (GSPC)
January 1928
-1.07%
the S&P 500 (GSPC)
February 1928
-1.54%
the S&P 500 (GSPC)
March 1928
11.45%
the S&P 500 (GSPC)
April 1928
4.44%
the S&P 500 (GSPC)
May 1928
1.11%
the S&P 500 (GSPC)
June 1928
-4.63%
the S&P 500 (GSPC)
July 1928
2.37%
the S&P 500 (GSPC)
August 1928
7.47%
the S&P 500 (GSPC)
September 1928
0.81%
the S&P 500 (GSPC)
October 1928
1.5%
the S&P 500 (GSPC)
November 1928
10.41%
the S&P 500 (GSPC)
December 1928
2.1%
the S&P 500 (GSPC)
January 1929
3.75%
the S&P 500 (GSPC)
February 1929
-0.97%
the S&P 500 (GSPC)
March 1929
-1.16%
the S&P 500 (GSPC)
April 1929
4.26%
the S&P 500 (GSPC)
May 1929
-4.46%
the S&P 500 (GSPC)
June 1929
8.47%
the S&P 500 (GSPC)
July 1929
4%
the S&P 500 (GSPC)
August 1929
9.04%
the S&P 500 (GSPC)
September 1929
-5.22%
the S&P 500 (GSPC)
October 1929
-19.45%
the S&P 500 (GSPC)
November 1929
-8.57%
the S&P 500 (GSPC)
December 1929
2.39%