Mon  Mean WWV (m**3) Std Deviation
1    8.36488502E+14  6.87888212E+13
2    7.94527409E+14  6.37537522E+13
3    7.4781756E+14   5.92509277E+13
4    7.21668993E+14  5.35892884E+13
5    7.18979136E+14  4.55783523E+13
6    7.26286083E+14  3.83594099E+13
7    7.36411871E+14  3.55394535E+13
8    7.55631649E+14  4.00415523E+13
9    7.82852682E+14  5.10401582E+13
10   8.05103297E+14  5.85186903E+13
11   8.24840148E+14  6.70626008E+13
12   8.4538499E+14   6.77857576E+13