Since 1920, the New York Yankees have their lowest on-base percentage in a month in October 2017, with an on-base percentage of .188.

	TEAM	OBP	MONTH	G	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	.188	October 2017	1	.000	0	1	31	1	5	1	0	1	1	1	0	8	0	1	32	9	2	0	0	0	0	.161	.290	.478
2	Yankees	.200	October 1961	1	1.000	1	0	29	1	5	0	0	1	1	1	0	5	0	0	30	8	1	0	0	0	0	.172	.276	.476
3	Yankees	.212	October 1944	1	.000	0	1	32	2	6	2	1	0	2	1	0	4	1	0	34	10	3	1			1	.188	.313	.525
4	Yankees	.226	October 1972	5	.000	0	5	165	7	28	6	0	5	7	10	2	23	0	2	177	49	11	0	0	3	3	.170	.297	.523
5	Yankees	.228	October 2021	3	.333	1	2	95	6	17	2	1	1	6	5	1	28	0	0	101	24	4	0	0	0	3	.179	.253	.480
6	Yankees	.248	October 2004	3	.333	1	2	93	5	17	4	0	1	5	6	2	21	0	0	101	24	5	0	0	1	4	.183	.258	.506
7	Yankees	.250	October 1990	3	.333	1	2	93	7	15	3	0	1	4	11	0	22	3	1	104	21	4	0	0	1	2	.161	.226	.476
8	Yankees	.253	October 1983	2	.500	1	1	72	5	10	3	0	1	4	11	0	10	2	0	83	16	4	0	0	0	2	.139	.222	.475
9	Yankees	.263	October 1922	1	.000	0	1	33	1	5	1	0	0	1	5	0	5	0	0	38	6	1	0				.152	.182	.445
10	Yankees	.264	October 1978	2	.500	1	1	66	7	13	4	0	2	7	6	0	9	2	0	72	23	6	0	0	0	1	.197	.348	.612
11	Yankees	.266	September 1966	23	.348	8	15	781	75	164	13	4	26	72	56	5	150	4	3	853	263	43	7	4	2	5	.210	.337	.603
12	Yankees	.273	June 2023	23	.478	11	12	746	88	155	37	2	29	83	59	9	181	9	4	818	283	68	0	4	2	17	.208	.379	.652
13	Yankees	.273	October 1967	1	1.000	1	0	30	4	6	1	0	2	3	3	0	5	3	0	33	13	3	0	0	0	0	.200	.433	.706
14	Yankees	.274	September 1967	27	.444	12	15	852	65	180	24	2	12	56	73	2	178	18	9	947	244	38	16	4	6	16	.211	.286	.560
15	Yankees	.275	May 1967	25	.360	9	16	806	75	159	24	2	18	66	83	4	177	6	3	903	241	44	8	2	5	19	.197	.299	.574
16	Yankees	.276	October 1974	2	.500	1	1	73	4	18	1	1	1	4	3	0	7	1	0	76	24	3	0	0	0	1	.247	.329	.605
17	Yankees	.278	October 1938	2	.500	1	1	63	8	11	3	0	1	6	8	1	5	2		72	17	4	0				.175	.270	.548
18	Yankees	.279	April 1968	17	.471	8	9	542	50	101	13	1	9	45	70	1	98	17	4	621	143	23	4	4	3	8	.186	.264	.543
19	Yankees	.279	October 1985	6	.667	4	2	195	22	41	7	0	5	19	16	3	32	7	0	215	63	12	0	1	1	3	.210	.323	.602
20	Yankees	.281	August 1965	28	.536	15	13	945	92	229	31	7	33	89	52	1	167	2	5	1,010	373	71	8	4	9	15	.242	.395	.676
21	Yankees	.282	September 1965	27	.333	9	18	910	91	199	21	6	20	87	79	3	197	5	2	1,008	292	47	11	5	6	19	.219	.321	.603
22	Yankees	.284	May 1969	28	.444	12	15	923	84	204	30	7	16	79	82	2	147	19	11	1,019	296	53	4	8	6	16	.221	.321	.604
23	Yankees	.284	September 2014	27	.519	14	13	884	98	198	40	5	24	92	68	9	189	17	3	972	320	69	3	8	0	12	.224	.362	.646
24	Yankees	.284	August 1987	28	.393	11	17	949	104	228	38	1	36	99	57	4	162	7	2	1,028	376	75	11	7	5	22	.240	.396	.680
25	Yankees	.284	August 1968	36	.543	19	16	1,191	98	241	32	8	23	93	132	6	223	22	10	1,351	358	63	18	4	17	19	.202	.301	.585