team low era in april, in one season, all-time, 1+ er

The New York Mets have the lowest ERA by a team with 1+ earned run in a season in the month of April, with an ERA of 1.57 in 1968.

	TEAM	ERA	ER	SEASON	G	W%	W	L	SO	SHO	SV	IP	H	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Mets	1.57	27	1968	16	.438	7	9	116	3	3	154.2	119	41	4	48	1	7	626	7	6.75	2.79	2.42	0.23	18.5	7.7	1.08	.252	2.39	6.92
2	Cubs	1.63	31	1963	19	.474	9	10	102	1	6	171.2	131	39	10	38	3	3	673	3	5.35	1.99	2.68	0.52	15.2	5.6	0.98	.233	2.04	6.87
3	Indians	1.66	19	1966	11	.909	10	1	106	3	2	103.0	60	23	6	39	5	3	404	0	9.26	3.41	2.72	0.52	26.2	9.7	0.96	.218	2.01	5.24
4	Athletics	1.85	41	1978	21	.762	16	5	85	1	6	199.0	157	51	7	83	4	7	818	3	3.84	3.75	1.02	0.32	10.4	10.1	1.21	.235	2.31	7.10
5	Athletics	1.89	40	1981	21	.857	18	3	102	4	1	190.0	128	41	12	61	5	1	751	8	4.83	2.89	1.67	0.57	13.6	8.1	0.99	.203	1.94	6.06
6	Dodgers	1.93	37	1981	19	.737	14	5	105	4	6	172.1	139	38	5	46	0	2	675	2	5.48	2.40	2.28	0.26	15.6	6.8	1.07	.258	1.98	7.26
7	White Sox	2.01	28	1966	13	.769	10	3	80	1	5	125.2	90	31	8	45	2	3	504	6	5.73	3.22	1.78	0.57	15.9	8.9	1.07	.222	2.22	6.45
8	Twins	2.01	22	1972	11	.727	8	3	46	1	5	98.2	68	26	5	31	4	2	391	1	4.20	2.83	1.48	0.46	11.8	7.9	1.00	.207	2.37	6.20
9	Royals	2.06	29	1972	14	.429	6	8	59	2	1	126.2	111	33	5	36	0	2	509	4	4.19	2.56	1.64	0.36	11.6	7.1	1.16	.259	2.34	7.89
10	Colt .45's	2.06	35	1962	16	.467	7	8	118	2	2	152.2	130	44	8	38	7	2	613	3	6.96	2.24	3.11	0.47	19.2	6.2	1.10	.276	2.59	7.66
11	Dodgers	2.08	31	1972	15	.733	11	4	82	4	4	134.0	104	35	5	36	1	1	529	7	5.51	2.42	2.28	0.34	15.5	6.8	1.04	.244	2.35	6.99
12	Dodgers	2.08	31	1965	15	.667	10	5	111	1	2	134.0	94	35	7	37	5	5	533	5	7.46	2.49	3.00	0.47	20.8	6.9	0.98	.233	2.35	6.31
13	Mets	2.13	41	1971	19	.632	12	7	131	1	3	173.0	128	54	10	62	1	9	700	1	6.82	3.23	2.11	0.52	18.7	8.9	1.10	.238	2.81	6.66
14	Dodgers	2.15	38	1966	18	.611	11	7	133	0	2	159.0	132	47	9	40	3	1	647	3	7.53	2.26	3.33	0.51	20.6	6.2	1.08	.266	2.66	7.47
15	Reds	2.16	44	1967	20	.750	15	5	151	2	9	183.1	134	50	10	77	6	5	757	5	7.41	3.78	1.96	0.49	19.9	10.2	1.15	.242	2.45	6.58
16	Cubs	2.16	38	1985	18	.667	12	6	105	3	5	158.0	135	46	7	38	2	7	631	2	5.98	2.16	2.76	0.40	16.6	6.0	1.09	.267	2.62	7.69
17	Yankees	2.17	28	1958	13	.692	9	4	69	3	3	116.0	96	34	5	52	1	1	480	1	5.35	4.03	1.33	0.39	14.4	10.8	1.28	.258	2.64	7.45
18	Giants	2.17	38	1968	17	.588	10	7	107	3	1	157.1	135	45	9	27	1	8	624	5	6.12	1.54	3.96	0.51	17.1	4.3	1.03	.263	2.57	7.72
19	Orioles	2.17	36	1968	16	.625	10	6	112	1	7	149.0	92	44	7	69	5	6	599	3	6.77	4.17	1.62	0.42	18.7	11.5	1.08	.209	2.66	5.56
20	Tigers	2.18	37	1968	17	.706	12	5	96	2	3	153.0	115	40	12	58	2	4	622	6	5.65	3.41	1.66	0.71	15.4	9.3	1.13	.227	2.35	6.76
21	Angels	2.21	52	1982	22	.682	15	7	89	2	2	211.2	179	60	9	75	8	6	864	6	3.78	3.19	1.19	0.38	10.3	8.7	1.20	.249	2.55	7.61
22	Yankees	2.23	19	1964	8	.500	4	4	41	1	2	76.2	68	22	2	28	0	5	327	1	4.81	3.29	1.46	0.23	12.5	8.6	1.25	.258	2.58	7.98
23	Red Sox	2.24	28	1952	12	.833	10	2	50	1	2	112.2	95	30	6	53	2		477	2	3.99	4.23	0.94	0.48	10.5	11.1	1.31	.243	2.40	7.59
24	Tigers	2.25	24	1972	11	.636	7	4	70	1	2	96.0	56	25	7	37	2	1	376	3	6.56	3.47	1.89	0.66	18.6	9.8	0.97	.188	2.34	5.25
25	White Sox	2.25	20	1964	9	.556	5	4	59	0	3	80.0	72	25	9	21	1	2	324	5	6.64	2.36	2.81	1.01	18.2	6.5	1.16	.269	2.81	8.10