The Toronto Blue Jays have the worst record by a team in a month in the month of June, with a record of 0-10 in June 1981.

	TEAM	REC	MONTH	W%	G	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Blue Jays	0-10	June 1981	.000	10	0	10	338	22	77	7	2	6	21	20	0	56	5	6	361	106	15	2	1	0	8	.228	.270	.314	.584
2	Diamondbacks	3-24	June 2021	.111	27	3	24	921	103	208	46	2	17	96	85	7	240	4	4	1,021	309	65	5	3	1	10	.226	.295	.336	.631
3	Superbas	3-20	June 1905	.130	23	3	20	744	63	168	23	8	2		54	8		25		827	213	33	21				.226	.285	.286	.572
4	Athletics	3-19	June 1916	.136	22	3	19	711	53	168	24	7	0		66	5	95	26		805	206	31	23				.236	.306	.290	.595
5	Red Sox	4-24	June 1927	.143	28	4	24	948	113	258	47	17	3	108	69	3	74	8		1,062	348	67	42				.272	.324	.367	.691
6	Athletics	4-24	June 1920	.143	28	4	24	958	97	237	36	15	8	84	67	7	109	15		1,057	327	59	25				.247	.301	.341	.643
7	Browns	3-18	June 1911	.143	21	3	18	703	71	168	18	7	2		70	4		11		797	206	27	20				.239	.311	.293	.604
8	Phillies	4-22	June 1997	.154	26	4	22	874	94	213	54	10	13	87	91	5	172	10	6	992	326	77	11	11	6	14	.244	.315	.373	.688
9	Cubs	4-21	June 1954	.160	25	4	21	841	78	181	36	7	24	69	91	6	121	1	6	951	303	67	11	2		26	.215	.296	.360	.656
10	Dodgers	4-21	June 1936	.160	25	4	21	861	74	207	34	5	5	69	54	4	85	9		927	266	44	8				.240	.288	.309	.597
11	Braves	4-20	June 1928	.167	24	4	20	815	101	218	46	2	15	93	68	3	56	3		911	313	63	25				.267	.326	.384	.710
12	Athletics	5-24	June 1979	.172	29	5	24	976	104	227	36	4	23	100	98	4	134	13	12	1,102	340	63	15	9	7	18	.233	.303	.348	.651
13	Phillies	4-19	June 1936	.174	23	4	19	828	109	237	33	8	15	103	61	3	92	7		901	331	56	9				.286	.337	.400	.737
14	Senators	4-19	June 1904	.174	24	4	19	825	67	181	27	6	0	50	51	8		27		903	220	33	19				.219	.271	.267	.538
15	Marlins	5-23	June 2011	.179	28	5	23	951	81	214	45	5	18	77	71	10	216	13	3	1,050	323	68	11	7	3	15	.225	.284	.340	.624
16	Orioles	5-23	June 1987	.179	28	5	23	972	114	245	42	3	35	112	85	3	163	14	4	1,066	398	80	2	4	4	27	.252	.313	.409	.722
17	Red Sox	5-23	June 1932	.179	28	5	23	970	101	262	36	14	10	98	64	3	97	7		1,051	356	60	14				.270	.317	.367	.684
18	Doves	4-18	June 1909	.182	22	4	18	730	70	167	15	12	4		43	2		14		800	218	31	25				.229	.274	.299	.572
19	Tigers	5-22	June 2003	.185	27	5	22	939	95	232	33	11	23	91	66	8	191	22	16	1,035	356	67	10	12	3	15	.247	.299	.379	.678
20	Braves	5-22	June 1923	.185	27	5	22	923	115	254	26	11	13	105	70	6	79	9		1,032	341	50	33				.275	.330	.369	.700
21	Reds	4-17	June 1918	.190	22	4	17	731	63	188	25	10	2		45	5	54	21		801	239	37	20				.257	.305	.327	.632
22	Athletics	5-21	June 2022	.192	26	5	21	861	75	180	41	0	21	71	53	9	208	14	6	926	284	62	3	0	0	13	.209	.262	.330	.592
23	Mets	5-21	June 2018	.192	26	5	21	868	89	182	42	4	27	86	93	11	236	9	3	984	313	73	6	6	7	23	.210	.292	.361	.653
24	Royals	5-21	June 2018	.192	26	5	21	839	58	162	37	5	15	56	57	12	205	12	8	913	254	57	1	4	1	23	.193	.253	.303	.556
25	Devil Rays	5-21	June 2003	.192	26	5	21	885	103	226	54	8	17	95	75	8	180	22	6	978	347	79	4	6	9	21	.255	.317	.392	.709