Mon  Mean WWV (m**3) Std Deviation
 1   2.52278997E+15  6.2254624E+13
 2   2.49044967E+15  5.70479199E+13
 3   2.45566258E+15  6.1757167E+13
 4   2.42072517E+15  6.42525178E+13
 5   2.39014742E+15  7.32524288E+13
 6   2.36732021E+15  7.84544228E+13
 7   2.36077226E+15  7.9800484E+13
 8   2.38276491E+15  7.7384288E+13
 9   2.42609012E+15  7.51044322E+13
10   2.47477331E+15  7.42279904E+13
11   2.51805343E+15  7.28509836E+13
12   2.53678109E+15  6.52195943E+13