who has the highest obp in a month with minimum 100 pas

Barry Bonds has the best on-base percentage when making 100+ plate appearances in a month, with an on-base percentage of .621 in August 2002.

	NAME	OBP	PA	MONTH	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS
1	Barry Bonds B. Bonds	.621	116	August 2002	27	76	24	34	6	0	11	25	37	1	7	1	1	73	17	0	2	11	1	.447	.961	1.581
2	Barry Bonds B. Bonds	.615	109	August 2004	27	70	27	29	6	1	11	27	38	0	7	2	1	70	18	0	1	15	0	.414	1.000	1.615
3	Barry Bonds B. Bonds	.614	114	September 2002	25	69	20	25	4	0	6	22	43	2	7	3	0	47	10	0	0	15	1	.362	.681	1.295
4	Barry Bonds B. Bonds	.612	116	June 2004	27	67	23	22	4	0	6	14	46	3	6	0	0	44	10	0	0	23	0	.328	.657	1.269
5	Barry Bonds B. Bonds	.611	108	September 2004	25	63	22	22	4	2	7	13	40	4	12	0	0	51	13	0	1	23	1	.349	.810	1.421
6	Babe Ruth B. Ruth	.611	147	July 1920	34	100	45	44	10	2	13	33	43	1	19	5		97	25	3				.440	.970	1.581
7	Barry Bonds B. Bonds	.604	111	June 2002	26	70	19	26	4	1	7	17	40	1	8	1	0	53	12	0	0	17	1	.371	.757	1.361
8	Jason Giambi J. Giambi	.604	111	June 2000	25	80	24	36	11	0	5	23	30	1	14	1	0	62	16	0	0	2	2	.450	.775	1.379
9	Barry Bonds B. Bonds	.600	100	April 2002	24	64	22	24	5	0	8	17	32	4	5	1	0	53	13	0	0	12	0	.375	.828	1.428
10	Joe Jackson J. Jackson	.598	106	September 1912	25	83	24	42	6	4	0	23	14	5	2	3		56	10	4				.506	.675	1.273
11	Ted Williams T. Williams	.595	116	June 1948	24	87	24	40	12	0	5	28	29	0	3	0		67	17	0			2	.460	.770	1.365
12	Frank Thomas F. Thomas	.593	118	May 1994	25	84	39	38	9	0	12	28	31	1	11	0	0	83	21	0	2	3	3	.452	.988	1.581
13	Ted Williams T. Williams	.592	157	August 1941	35	107	31	43	4	2	10	26	50	0	8	0		81	16	0			2	.402	.757	1.349
14	Todd Helton T. Helton	.588	102	May 2000	23	82	32	42	7	0	11	26	18	0	9	0	0	82	18	0	2	5	2	.512	1.000	1.588
15	Harry Heilmann H. Heilmann	.586	119	August 1927	28	97	28	49	9	3	5	22	19	0	1	1		79	17	3				.505	.814	1.401
16	Babe Ruth B. Ruth	.586	117	August 1923	25	86	25	38	9	1	8	30	28	2	12	2		73	18	1				.442	.849	1.435
17	Charlie Gehringer C. Gehringer	.586	152	August 1937	32	122	38	59	11	0	7	38	30	0	2	6		91	18	0				.484	.746	1.331
18	Rogers Hornsby R. Hornsby	.584	126	June 1925	28	100	31	48	9	2	9	31	25	0	6	2		88	20	1				.480	.880	1.464
19	Lou Gehrig L. Gehrig	.582	137	June 1930	28	111	37	55	11	3	10	41	20	3	10	5		102	24	3				.495	.919	1.501
20	Wade Boggs W. Boggs	.581	125	June 1987	26	101	26	49	8	4	4	19	22	1	5	0	0	77	16	1	0	8	4	.485	.762	1.343
21	Babe Ruth B. Ruth	.580	131	August 1932	29	92	30	37	4	1	9	26	37	2	13	0		70	14	0				.402	.761	1.341
22	Babe Ruth B. Ruth	.580	131	June 1920	29	100	38	45	7	4	12	37	30	1	17	6		96	23	0				.450	.960	1.540
23	Ted Williams T. Williams	.579	114	July 1957	28	84	21	37	9	1	9	21	28	1	9	0	0	75	19	0	1	13	2	.440	.893	1.472
24	Joe Jackson J. Jackson	.579	114	May 1913	27	97	24	49	10	7	1	23	16	1	5	4		76	18	0				.505	.784	1.362
25	Babe Ruth B. Ruth	.578	129	August 1921	28	98	38	44	13	2	10	34	30	0	13	2		91	25	1				.449	.929	1.507