what team has the lowest era in a month since 1990 minimum 25 games played

Since 1990, the San Francisco Giants have the best ERA by a team when pitching in 25+ games in a month, with an ERA of 1.78 in September 2010.

	TEAM	ERA	G	MONTH	W%	W	L	SO	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Giants	1.78	26	September 2010	.692	18	8	234	0	12	232.1	151	46	50	15	58	7	6	902	4	9.06	2.25	4.03	0.58	25.9	6.4	0.90	.231	1.94	5.85
2	Dodgers	2.03	29	August 2013	.793	23	6	248	0	10	261.1	224	59	68	16	61	7	10	1,050	7	8.54	2.10	4.07	0.55	23.6	5.8	1.09	.290	2.34	7.71
3	Padres	2.17	27	May 2007	.667	18	9	190	0	12	245.0	202	59	67	11	58	5	5	976	5	6.98	2.13	3.28	0.40	19.5	5.9	1.06	.268	2.46	7.42
4	Athletics	2.17	28	August 2002	.857	24	4	184	1	12	257.0	193	62	72	17	71	9	4	1,022	2	6.44	2.49	2.59	0.60	18.0	6.9	1.03	.238	2.52	6.76
5	Indians	2.17	29	September 2017	.862	25	4	288	1	10	261.0	223	63	67	20	49	6	0	1,023	9	9.93	1.69	5.88	0.69	28.2	4.8	1.04	.308	2.31	7.69
6	Guardians	2.19	25	September 2024	.600	15	10	238	0	8	222.0	166	54	70	15	66	12	1	895	6	9.65	2.68	3.61	0.61	26.6	7.4	1.05	.268	2.84	6.73
7	Dodgers	2.25	27	August 2021	.778	21	6	278	0	12	252.0	161	63	69	22	88	10	17	1,006	9	9.93	3.14	3.16	0.79	27.6	8.7	0.99	.229	2.46	5.75
8	Dodgers	2.26	28	August 2022	.786	22	6	254	0	6	251.1	165	63	74	24	71	13	0	995	8	9.10	2.54	3.58	0.86	25.5	7.1	0.94	.223	2.65	5.91
9	Astros	2.26	29	May 2022	.724	21	8	233	0	8	255.0	200	64	75	19	72	8	0	1,026	6	8.22	2.54	3.24	0.67	22.7	7.0	1.07	.261	2.65	7.06
10	Rays	2.27	28	August 2012	.607	17	11	214	1	9	249.2	193	63	69	22	50	9	2	977	9	7.71	1.80	4.28	0.79	21.9	5.1	0.97	.251	2.49	6.96
11	Cardinals	2.33	26	June 2015	.692	18	8	207	0	11	231.2	209	60	64	16	52	3	5	939	4	8.04	2.02	3.98	0.62	22.0	5.5	1.13	.292	2.49	8.12
12	Yankees	2.37	28	May 2024	.750	21	7	241	0	8	247.0	173	65	73	25	78	16	0	987	3	8.78	2.84	3.09	0.91	24.4	7.9	1.02	.236	2.66	6.30
13	Braves	2.39	27	September 2012	.704	19	8	214	0	11	240.2	181	64	75	18	63	6	6	964	11	8.00	2.36	3.40	0.67	22.2	6.5	1.01	.246	2.80	6.77
14	Indians	2.41	27	August 2014	.667	18	9	245	0	7	250.0	206	67	80	14	72	14	6	1,029	4	8.82	2.59	3.40	0.50	23.8	7.0	1.11	.281	2.88	7.42
15	Braves	2.42	26	July 2004	.769	20	6	178	0	10	238.1	207	64	72	15	74	4	7	972	2	6.72	2.79	2.41	0.57	18.3	7.6	1.18	.274	2.72	7.82
16	Indians	2.42	28	June 2016	.786	22	6	242	2	6	249.1	193	67	75	26	65	4	4	985	8	8.74	2.35	3.72	0.94	24.6	6.6	1.03	.258	2.71	6.97
17	Brewers	2.42	27	September 1992	.741	20	7	147	3	8	245.1	213	66	69	13	60	3	1	981	6	5.39	2.20	2.45	0.48	15.0	6.1	1.11	.264	2.53	7.81
18	Athletics	2.43	27	May 1990	.667	18	9	138	1	12	241.0	197	65	77	18	60	3	1	959	11	5.15	2.24	2.30	0.67	14.4	6.3	1.07	.242	2.88	7.36
19	Astros	2.47	27	April 2018	.667	18	9	288	0	6	243.2	175	67	73	25	67	9	1	961	9	10.64	2.47	4.30	0.92	30.0	7.0	0.99	.262	2.70	6.46
20	Astros	2.48	29	July 2005	.759	22	7	212	0	11	265.1	222	73	88	17	78	11	2	1,086	7	7.19	2.65	2.72	0.58	19.5	7.2	1.13	.267	2.98	7.53
21	Athletics	2.48	28	August 2005	.607	17	11	207	0	9	257.2	202	71	79	22	77	8	4	1,031	6	7.23	2.69	2.69	0.77	20.1	7.5	1.08	.251	2.76	7.06
22	Nationals	2.48	27	May 2018	.741	20	7	263	0	11	243.0	193	67	71	19	68	13	6	977	3	9.74	2.52	3.87	0.70	26.9	7.0	1.07	.283	2.63	7.15
23	Mets	2.48	25	July 2022	.680	17	8	259	0	9	228.1	177	63	68	25	62	11	2	903	3	10.21	2.44	4.18	0.99	28.7	6.9	1.05	.278	2.68	6.98
24	Pirates	2.49	26	September 2014	.654	17	9	240	0	10	231.1	181	64	73	11	76	15	4	939	16	9.34	2.96	3.16	0.43	25.6	8.1	1.11	.285	2.84	7.04
25	Dodgers	2.49	28	June 2014	.643	18	10	232	1	10	245.1	203	68	71	24	54	4	4	977	12	8.51	1.98	4.30	0.88	23.7	5.5	1.05	.270	2.60	7.45