═════════╤═════╤═════╤═════╤═════╤═════╤═════╤═════╤═════╤═════╤═════╤═══════ │1870.│1871.│1872.│1873.│1874.│1875.│1876.│1877.│1878.│1879.│Ten-yr. │ │ │ │ │ │ │ │ │ │ │ av. ─────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────── January │ .72│ .47│ .41│ .31│ .55│ .66│ .43│ .44│ .42│ .30│ .471 February │ .70│ .52│ .40│ .31│ .58│ .64│ .41│ .42│ .40│ .32│ .470 March │ .72│ .54│ .38│ .32│ .60│ .66│ .44│ .40│ .42│ .33│ .481 April │ .82│ .54│ .40│ .34│ .63│ .71│ .47│ .46│ .40│ .32│ .509 May │ .87│ .54│ .46│ .39│ .62│ .71│ .47│ .53│ .40│ .34│ .533 June │ .83│ .53│ .49│ .34│ .60│ .67│ .45│ .46│ .36│ .36│ .509 July │ .83│ .51│ .41│ .36│ .62│ .70│ .46│ .48│ .38│ .36│ .511 August │ .74│ .45│ .41│ .39│ .67│ .69│ .45│ .45│ .39│ .33│ .497 September│ .64│ .47│ .36│ .40│ .77│ .59│ .45│ .44│ .36│ .35│ .483 October │ .60│ .47│ .33│ .38│ .76│ .55│ .44│ .43│ .34│ .41│ .471 November │ .61│ .46│ .33│ .38│ .77│ .52│ .44│ .45│ .32│ .42│ .470 December │ .50│ .41│ .31│ .50│ .78│ .49│ .45│ . 44│ .31│ .41│ .460 ─────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────── Yearly │ .715│ .492│ .381│ .368│ .662│ .632│ .446│ .450│ .375│ .354│ .487 aver. │ │ │ │ │ │ │ │ │ │ │ ─────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴───────