The monthly standard deviation of the S&P 500 monthly returns in 2020 is (%).

MCD price Dec-19 $ 197.61 Jan-20$ 213.97 Feb-20 $ 194.17 Mar-201$ 165.35 Apr-20$ 187.56 May-20 $ 186.32 Jun-20$ 184.47 Jul-20 $ 194.28 Aug-20$ 213.52 Sep-20$ 219.49 Oct-20 $ 213.00 Nov-20 $ 217.44 Dec-20 $ 214.58 MCD return S&P 500 level S&P 500 return 3,231 8.28% 3,226 -0.16% -9.25% 2,954 -8.41% -14.84% 2,585 -12.51% 13.43% 2,912 12.68% -0.66% 3,044 4.53% -0.99% 3,100 1.84% 5.32% 3,271 5.51% 9.90% 3,500 7.01% 2.80% 3,363 -3.92% -2.96% 3,270 -2.77% 2.08% 3,622 10.75% -1.32% 3,756 3.71%