what is the worst record by the red sox in a month since 1940 with a minimum of 10 games

Since 1940, the Boston Red Sox have their worst record with 10+ games played in a month in April 1966, with a record of 3-10.

	TEAM	REC	G	MONTH	W%	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	Red Sox	3-10	13	April 1966	.231	3	10	453	63	98	20	6	9	58	67	4	100	2	2	531	157	35	6	1	6	8	.216	.322	.347	.668
2	Red Sox	7-22	29	August 1964	.241	7	22	971	83	233	47	3	20	78	75	1	142	2	2	1,052	346	70	1	4	9	24	.240	.294	.356	.650
3	Red Sox	7-20	27	September 2011	.259	7	20	973	146	272	67	6	33	140	89	6	193	9	10	1,078	450	106	4	6	11	19	.280	.342	.462	.804
4	Red Sox	7-20	27	September 1952	.259	7	20	951	101	233	36	5	19	94	94	2	133	15	7	1,056	336	60	9			21	.245	.314	.353	.668
5	Red Sox	7-19	26	September 2012	.269	7	19	863	78	189	37	3	16	75	59	3	186	20	8	939	280	56	8	6	2	17	.219	.270	.324	.594
6	Red Sox	7-19	26	April 1996	.269	7	19	911	120	240	46	5	24	113	93	5	156	13	8	1,022	368	75	4	9	3	32	.263	.332	.404	.736
7	Red Sox	3-8	11	April 1945	.273	3	8	384	35	97	10	2	4	32	27	4	39	3		420	123	16	5			13	.253	.308	.320	.629
8	Red Sox	8-21	29	August 1985	.276	8	21	1,033	136	280	55	6	28	132	85	4	155	18	1	1,143	431	89	12	9	3	24	.271	.326	.417	.743
9	Red Sox	8-21	29	June 1965	.276	8	21	990	106	246	46	5	30	101	90	4	187	11	6	1,100	392	81	10	6	7	24	.248	.312	.396	.708
10	Red Sox	6-15	21	September 2001	.286	6	15	696	81	168	34	2	19	78	70	10	151	5	7	782	263	55	2	4	4	13	.241	.318	.378	.696
11	Red Sox	4-10	14	April 1958	.286	4	10	452	49	106	16	1	10	46	72	2	61	5	1	534	154	27	6	2	3	19	.235	.341	.341	.682
12	Red Sox	9-22	31	July 1961	.290	9	22	1,080	141	293	43	6	25	136	124	3	147	13	6	1,232	423	74	15	10	9	28	.271	.345	.392	.737
13	Red Sox	8-19	27	September 2023	.296	8	19	924	101	214	48	4	23	93	68	13	272	15	4	1,012	339	75	2	5	4	20	.232	.292	.367	.659
14	Red Sox	8-19	27	July 2022	.296	8	19	925	104	220	53	3	27	94	62	5	265	9	4	998	360	83	2	4	1	15	.238	.288	.389	.677
15	Red Sox	8-19	27	June 1994	.296	8	19	944	122	247	54	3	26	117	95	6	172	21	9	1,057	385	83	5	7	10	27	.262	.331	.408	.739
16	Red Sox	9-21	30	August 2006	.300	9	21	1,026	132	257	54	2	35	123	118	11	189	13	6	1,166	420	91	5	6	16	23	.250	.332	.409	.742
17	Red Sox	9-21	30	July 1965	.300	9	21	1,025	115	286	41	9	25	108	95	6	172	6	3	1,144	420	75	11	7	4	34	.279	.342	.410	.751
18	Red Sox	9-20	29	August 2012	.310	9	20	1,037	139	290	70	2	26	129	66	6	213	28	5	1,123	442	98	4	10	6	17	.280	.324	.426	.750
19	Red Sox	10-22	32	June 1960	.313	10	22	1,097	142	280	47	2	34	136	114	4	165	6	2	1,241	433	83	13	13	11	32	.255	.324	.395	.719
20	Red Sox	10-21	31	June 1966	.323	10	21	1,078	139	258	51	9	36	131	97	7	201	1	4	1,196	435	96	8	6	2	27	.239	.305	.404	.708
21	Red Sox	9-18	27	August 2020	.333	9	18	932	125	238	55	6	34	119	79	9	250	10	3	1,024	407	95	1	3	2	23	.255	.319	.437	.755
22	Red Sox	9-18	27	June 2000	.333	9	18	955	118	250	51	6	23	112	110	7	199	6	10	1,095	382	80	13	10	9	17	.262	.339	.400	.739
23	Red Sox	4-8	12	August 1994	.333	4	8	432	56	119	25	2	11	56	46	4	88	10	4	488	181	38	5	1	4	8	.275	.350	.419	.769
24	Red Sox	4-8	12	April 1954	.333	4	8	408	37	106	20	3	7	35	42	1	39	6	2	458	153	30	5	2		16	.260	.329	.375	.704
25	Red Sox	8-16	24	September 1944	.333	8	16	865	111	226	49	5	3	104	66	4	86	9		953	294	57	18			13	.261	.317	.340	.656