The New York Mets have the most wins by a team in a month in the month of June, with 21 wins in June 1990.

	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	Mets	21	June 1990	7	.750	28	984	172	292	65	5	39	161	104	7	130	18	9	1,112	484	109	6	11	13	18	.297	.364	.492	.856
2	Mets	19	June 1986	9	.679	28	967	148	272	47	5	32	132	116	1	159	28	7	1,102	425	84	10	8	14	17	.281	.356	.440	.796
3	Mets	19	June 1969	9	.679	28	912	100	215	28	9	15	96	94	4	187	17	12	1,032	306	52	14	8	13	13	.236	.307	.336	.643
4	Mets	18	June 2010	8	.692	26	886	126	243	51	5	24	122	61	7	158	22	8	970	376	80	9	7	6	16	.274	.324	.424	.748
5	Mets	18	June 1971	11	.621	29	974	98	241	31	6	21	88	111	4	169	18	10	1,113	347	58	18	6	10	34	.247	.325	.356	.681
6	Mets	17	June 1999	10	.630	27	937	146	261	48	5	33	145	116	5	172	35	11	1,083	418	86	14	11	9	19	.279	.357	.446	.803
7	Mets	16	June 2024	8	.667	24	835	153	234	56	4	41	148	88	15	180	17	3	946	421	101	0	8	2	21	.280	.356	.504	.860
8	Mets	16	June 2011	11	.593	27	960	149	272	39	15	15	137	98	10	163	33	9	1,086	386	69	5	13	8	20	.283	.352	.402	.754
9	Mets	16	June 2000	8	.667	24	829	157	238	51	3	37	154	90	9	144	7	7	942	406	91	4	10	9	15	.287	.359	.490	.849
10	Mets	16	June 1987	12	.571	28	974	142	262	47	7	36	138	85	8	175	18	10	1,085	431	90	12	6	11	13	.269	.331	.443	.773
11	Mets	16	June 1984	12	.571	28	938	102	241	44	1	19	93	77	3	182	24	6	1,036	344	64	11	7	12	37	.257	.313	.367	.680
12	Mets	16	June 1975	15	.516	31	1,063	99	267	34	8	7	87	83	6	141	8	7	1,175	338	49	16	7	17	24	.251	.307	.318	.625
13	Mets	16	June 1968	14	.533	30	1,010	107	252	29	6	20	99	73	6	231	17	11	1,109	353	55	12	8	9	18	.250	.302	.350	.651
14	Mets	15	June 2021	15	.500	30	922	105	205	41	2	33	101	80	19	265	8	6	1,035	349	76	10	4	5	26	.222	.297	.379	.675
15	Mets	15	June 2012	13	.536	28	963	142	245	57	4	29	139	92	7	198	21	7	1,079	397	90	8	9	8	15	.254	.321	.412	.733
16	Mets	15	June 2006	12	.556	27	949	152	259	61	11	40	144	75	12	185	33	9	1,059	462	112	16	7	8	10	.273	.332	.487	.819
17	Mets	15	June 1997	12	.556	27	889	122	243	47	6	29	112	86	14	175	15	14	1,011	389	82	9	13	15	22	.273	.342	.438	.780
18	Mets	15	June 1996	13	.536	28	964	124	259	57	7	22	115	70	5	177	25	8	1,055	396	86	6	10	11	21	.269	.318	.411	.729
19	Mets	15	June 1989	11	.577	26	893	127	225	47	3	32	118	91	6	147	26	6	1,003	374	82	6	7	11	20	.252	.323	.419	.742
20	Mets	15	June 1988	13	.536	28	989	120	268	39	7	23	116	92	7	138	27	12	1,120	390	69	16	16	19	19	.271	.332	.394	.727
21	Mets	15	June 1980	14	.517	29	963	107	249	34	5	15	101	92	5	160	31	17	1,087	338	54	16	11	14	30	.259	.323	.351	.674
22	Mets	15	June 1979	11	.577	26	900	106	233	42	7	15	97	93	8	136	27	19	1,018	334	64	10	7	12	19	.259	.331	.371	.702
23	Mets	15	June 1977	13	.536	28	921	101	229	42	4	16	84	97	7	134	26	15	1,044	327	62	15	4	12	25	.249	.324	.355	.679
24	Mets	15	June 1976	13	.536	28	925	94	208	40	4	24	88	77	3	141	3	7	1,025	328	68	16	4	8	24	.225	.285	.355	.640
25	Mets	15	June 1970	10	.600	25	844	130	233	26	4	27	120	86	6	155	20	11	956	348	57	12	8	4	20	.276	.344	.412	.757