The Philadelphia Phillies had their best slugging percentage in a month in October 1989, with a slugging percentage of .719.

	TEAM	SLG	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	OBP	OPS
1	Phillies	.719	October 1989	1	1.000	1	0	32	5	11	4	1	2	5	1	0	3	1	0	33	23	7	0	0	0	2	.344	.364	1.082
2	Phillies	.659	March 2014	1	1.000	1	0	44	14	17	3	0	3	13	6	0	8	3	0	50	29	6	0	0	0	0	.386	.460	1.119
3	Phillies	.641	March 2023	1	.000	0	1	39	7	12	4	3	1	6	2	0	13	1	0	41	25	8	0	0	1	0	.308	.341	.982
4	Phillies	.637	October 2004	3	.667	2	1	102	19	35	10	1	6	19	7	1	16	0	0	114	65	17	3	1	1	2	.343	.387	1.025
5	Phillies	.588	October 2017	1	1.000	1	0	34	11	11	3	0	2	10	7	0	11	1	0	42	20	5	1	0	0	1	.324	.439	1.027
6	Phillies	.568	October 2023	1	1.000	1	0	37	9	12	1	1	2	9	4	0	7	1	0	42	21	4	0	1	0	1	.324	.381	.949
7	Phillies	.562	March 2019	3	1.000	3	0	89	23	21	3	1	8	23	20	2	26	1	1	112	50	12	0	1	3	1	.236	.384	.946
8	Phillies	.548	August 2023	27	.630	17	10	932	176	267	59	4	59	173	90	20	215	17	4	1,053	511	122	2	9	3	22	.286	.359	.907
9	Phillies	.547	October 1960	2	1.000	2	0	64	13	25	2	1	2	11	6	1	9	2	3	75	35	5	3	1	0	1	.391	.444	.991
10	Phillies	.531	March 2008	1	.000	0	1	32	6	8	3	0	2	6	2	0	8	0	0	36	17	5	1	1	0	1	.250	.286	.817
11	Phillies	.528	March 2025	4	.750	3	1	142	25	41	8	1	8	23	19	1	35	1	1	162	75	17	0	0	0	4	.289	.377	.905
12	Phillies	.528	October 1949	2	.500	1	1	72	13	21	3	1	4	13	9	0	10	0		82	38	8	1			2	.292	.370	.898
13	Phillies	.526	July 2007	25	.600	15	10	937	161	294	70	9	37	154	98	16	173	22	4	1,064	493	116	4	9	11	27	.314	.385	.911
14	Phillies	.521	October 1929	2	.500	1	1	73	8	22	2	1	4	8	2	0	4	0		75	38	7	0				.301	.320	.841
15	Phillies	.515	May 1925	25	.480	12	13	899	162	298	63	9	28	146	87	5	87	11		1,014	463	100	23				.331	.394	.909
16	Phillies	.500	July 1929	29	.345	10	19	1,056	172	337	63	13	34	161	98	5	98	7		1,177	528	110	18				.319	.380	.880
17	Phillies	.500	May 1929	26	.577	15	11	918	180	303	47	2	35	169	119	5	92	16		1,073	459	84	31				.330	.410	.910
18	Phillies	.493	October 1972	4	.500	2	2	146	22	42	4	1	8	21	11	0	26	0	2	159	72	13	2	0	1	2	.288	.338	.831
19	Phillies	.492	April 1976	14	.571	8	6	498	91	151	29	7	17	88	57	5	71	7	6	580	245	53	8	12	11	8	.303	.372	.864
20	Phillies	.491	October 1923	3	.333	1	2	106	15	35	4	2	3	14	5	1	8	1		115	52	9	3				.330	.366	.857
21	Phillies	.490	June 1930	28	.429	12	16	1,039	181	361	81	11	15	171	77	5	71	9		1,138	509	107	17				.347	.395	.885
22	Phillies	.488	July 1930	33	.242	8	25	1,200	211	395	74	6	35	203	86	6	90	5		1,323	586	115	31				.329	.377	.865
23	Phillies	.486	July 1977	30	.633	19	11	1,034	171	306	42	16	41	163	103	8	151	34	17	1,172	503	99	16	11	14	27	.296	.361	.847
24	Phillies	.486	October 1995	1	.000	0	1	35	2	8	1	1	2	2	6	0	8	0	0	41	17	4	0	0	0	0	.229	.341	.827
25	Phillies	.484	August 1993	27	.593	16	11	963	163	276	54	14	36	150	112	8	182	18	7	1,102	466	104	14	5	14	15	.287	.364	.848