Since 1943, the New York Yankees have their worst on-base percentage with 8+ games played in Octobers, with an on-base percentage of .321.
| 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 | .321 | 126 | October | .516 | 65 | 61 | 4,278 | 511 | 1,071 | 187 | 26 | 116 | 475 | 419 | 36 | 797 | 85 | 31 | 4,783 | 1,658 | 329 | 22 | 28 | 29 | 99 | .250 | .388 | .708 |
| 2 | | Yankees | .332 | 2,186 | September | .584 | 1,276 | 908 | 74,227 | 10,284 | 19,247 | 3,225 | 455 | 2,262 | 9,717 | 7,784 | 554 | 12,818 | 1,102 | 416 | 83,710 | 30,168 | 5,942 | 650 | 495 | 481 | 1,656 | .259 | .406 | .739 |
| 3 | | Yankees | .335 | 2,211 | May | .571 | 1,259 | 945 | 75,395 | 10,638 | 19,678 | 3,374 | 492 | 2,313 | 10,071 | 8,103 | 596 | 12,196 | 1,202 | 505 | 85,356 | 30,975 | 6,179 | 665 | 597 | 496 | 1,786 | .261 | .411 | .746 |
| 4 | | Yankees | .336 | 2,410 | August | .561 | 1,350 | 1,058 | 82,609 | 11,501 | 21,864 | 3,709 | 501 | 2,604 | 10,906 | 8,500 | 630 | 13,413 | 1,151 | 517 | 93,116 | 34,387 | 6,814 | 801 | 576 | 531 | 1,893 | .265 | .416 | .752 |
| 5 | | Yankees | .336 | 2,227 | June | .569 | 1,266 | 959 | 76,435 | 10,745 | 20,087 | 3,363 | 444 | 2,455 | 10,213 | 8,224 | 538 | 12,243 | 1,103 | 493 | 86,468 | 31,703 | 6,262 | 703 | 568 | 514 | 1,742 | .263 | .415 | .751 |
| 6 | | Yankees | .339 | 1,534 | April | .560 | 858 | 675 | 52,003 | 7,315 | 13,472 | 2,406 | 270 | 1,597 | 6,891 | 6,030 | 439 | 8,796 | 932 | 398 | 59,319 | 21,209 | 4,273 | 416 | 431 | 335 | 1,275 | .259 | .408 | .746 |
| 7 | | Yankees | .339 | 2,234 | July | .582 | 1,297 | 931 | 76,494 | 11,035 | 20,562 | 3,461 | 497 | 2,383 | 10,447 | 7,878 | 595 | 12,037 | 1,068 | 490 | 86,294 | 32,166 | 6,341 | 748 | 579 | 455 | 1,807 | .269 | .421 | .760 |
| 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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