Since 1923, the New York Yankees have their worst on-base percentage with 8+ games played in Octobers, with an on-base percentage of .323.
| TEAM | OBP | G | MONTH | W% | W | L | AB | R | H | 2B | 3B | HR | RBI | BB | HBP | SO | SB | CS | PA | TB | XBH | SH | SF | IBB | GIDP | AVG | SLG | OPS | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Yankees | .323 | 141 | October | .518 | 73 | 68 | 4,778 | 587 | 1,205 | 209 | 32 | 132 | 546 | 473 | 37 | 837 | 93 | 31 | 5,347 | 1,874 | 373 | 31 | 28 | 29 | 99 | .252 | .392 | .715 |
| 2 | | Yankees | .337 | 2,734 | September | .591 | 1,611 | 1,113 | 92,892 | 13,192 | 24,405 | 4,100 | 689 | 2,673 | 12,418 | 10,005 | 641 | 14,750 | 1,371 | 416 | 105,063 | 37,902 | 7,462 | 1,030 | 495 | 481 | 1,731 | .263 | .408 | .745 |
| 3 | | Yankees | .341 | 3,000 | August | .567 | 1,698 | 1,296 | 103,235 | 14,888 | 27,711 | 4,670 | 793 | 3,110 | 14,072 | 10,990 | 731 | 15,547 | 1,404 | 517 | 116,740 | 43,297 | 8,573 | 1,208 | 576 | 531 | 1,990 | .268 | .419 | .761 |
| 4 | | Yankees | .341 | 2,741 | May | .585 | 1,597 | 1,133 | 93,748 | 13,753 | 24,944 | 4,308 | 757 | 2,819 | 12,982 | 10,325 | 712 | 14,082 | 1,447 | 505 | 106,433 | 39,223 | 7,884 | 1,051 | 597 | 496 | 1,850 | .266 | .418 | .760 |
| 5 | | Yankees | .342 | 1,785 | April | .570 | 1,015 | 767 | 60,599 | 8,748 | 15,879 | 2,819 | 393 | 1,786 | 8,219 | 7,126 | 481 | 9,743 | 1,054 | 398 | 69,263 | 24,842 | 4,998 | 626 | 431 | 335 | 1,310 | .262 | .410 | .752 |
| 6 | | Yankees | .343 | 2,771 | June | .580 | 1,603 | 1,162 | 95,640 | 14,134 | 25,732 | 4,317 | 730 | 3,033 | 13,378 | 10,416 | 629 | 14,205 | 1,381 | 493 | 108,359 | 40,608 | 8,080 | 1,106 | 568 | 514 | 1,812 | .269 | .425 | .767 |
| 7 | | Yankees | .346 | 2,841 | July | .594 | 1,682 | 1,150 | 97,995 | 14,812 | 26,825 | 4,539 | 793 | 3,004 | 13,963 | 10,374 | 716 | 14,141 | 1,373 | 490 | 110,892 | 41,962 | 8,336 | 1,228 | 579 | 455 | 1,892 | .274 | .428 | .774 |
| 8 | | Yankees | .370 | 18 | March | .778 | 14 | 4 | 603 | 119 | 161 | 28 | 2 | 40 | 114 | 93 | 10 | 149 | 5 | 1 | 715 | 313 | 70 | 2 | 7 | 1 | 19 | .267 | .519 | .889 |
Some of the information used here was obtained free of charge from Retrosheet.
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