The Pittsburgh Pirates had their most wins in a month in July 1932, in September 1908 and in September 1901, with 25 wins.

	TEAM	W	MONTH	L	W%	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Pirates	25	July 1932	13	.658	38	1,369	192	404	65	21	12	175	88	9	97	10		1,492	547	98	26				.295	.342	.400	.741
2	Pirates	25	September 1908	8	.758	33	1,106	155	294	30	14	4		91	13		50		1,258	364	48	48				.266	.329	.329	.658
3	Pirates	25	September 1901	7	.781	32	1,137	226	363	59	22	8	197	115	14	76	37		1,289	490	89	23				.319	.389	.431	.820
4	Pirates	24	July 1938	7	.774	32	1,135	167	331	70	10	12	157	108	4	75	10		1,267	457	92	20				.292	.355	.403	.758
5	Pirates	23	August 1928	9	.719	32	1,163	247	402	58	36	14	228	103	11	65	18		1,323	574	108	46				.346	.404	.494	.898
6	Pirates	22	July 1983	10	.688	32	1,120	149	316	37	5	36	139	82	4	169	24	18	1,229	471	78	18	5	15	24	.282	.332	.421	.752
7	Pirates	22	July 1941	9	.710	31	1,055	164	303	48	11	11	147	113	3	104	17		1,189	406	70	18			22	.287	.358	.385	.743
8	Pirates	22	September 1927	9	.710	31	1,006	122	298	39	14	10	117	64	5	60	14		1,112	395	63	37				.296	.341	.393	.734
9	Pirates	22	August 1909	7	.759	30	999	141	267	39	15	9		88	10		36		1,149	363	63	52				.267	.333	.363	.696
10	Pirates	22	June 1908	8	.733	30	1,020	141	270	33	25	8		83	6		44		1,113	377	66	38				.265	.324	.370	.693
11	Pirates	22	August 1902	8	.733	31	1,071	164	316	41	17	8	137	73	14	104	68		1,178	415	66	20				.295	.348	.387	.736
12	Pirates	22	May 1902	4	.846	26	885	166	268	32	25	4	138	94	9	79	37		1,014	362	61	26				.303	.376	.409	.785
13	Pirates	21	September 1992	8	.724	29	1,024	153	288	58	13	24	144	99	7	156	16	8	1,157	444	95	16	11	18	14	.281	.345	.434	.779
14	Pirates	21	August 1979	9	.700	30	1,041	151	285	43	12	29	145	104	5	151	27	11	1,179	439	84	20	9	23	25	.274	.340	.422	.762
15	Pirates	21	September 1978	9	.700	30	1,005	161	280	49	10	31	150	107	10	173	44	19	1,147	442	90	14	11	22	18	.279	.350	.440	.790
16	Pirates	21	June 1975	11	.656	32	1,093	154	305	49	6	39	148	93	9	150	12	12	1,225	483	94	18	12	14	22	.279	.337	.442	.779
17	Pirates	21	August 1960	10	.677	31	1,068	151	316	46	14	23	138	83	4	130	4	6	1,186	459	83	20	11	13	32	.296	.346	.430	.775
18	Pirates	21	August 1958	12	.636	33	1,105	142	300	51	11	32	137	69	7	150	8	2	1,206	469	94	18	7	16	26	.271	.316	.424	.741
19	Pirates	21	July 1926	10	.677	31	1,018	178	311	52	32	5	164	95	6	58	22		1,164	442	89	45				.306	.368	.434	.802
20	Pirates	21	August 1925	10	.677	31	1,080	170	313	59	12	15	157	86	4	73	24		1,193	441	86	23				.290	.344	.408	.753
21	Pirates	21	August 1924	10	.677	31	1,055	159	309	52	27	13	141	73	6	86	44		1,172	454	92	38				.293	.342	.430	.772
22	Pirates	21	September 1909	8	.724	29	936	143	247	48	27	4		107	4		33		1,096	361	79	49				.264	.342	.386	.728
23	Pirates	21	July 1907	8	.724	29	924	130	236	34	19	5		94	9		43		1,064	323	58	37				.255	.330	.350	.680
24	Pirates	21	August 1905	9	.700	30	992	129	250	34	16	8		70	3		43		1,060	340	58	32				.252	.303	.343	.646
25	Pirates	20	September 1979	10	.667	30	1,073	150	293	46	6	19	132	100	7	171	54	12	1,213	408	71	22	11	23	24	.273	.336	.380	.716