the best whip in a month,minimum 40 innings pitched

Frank Smith has the lowest WHIP when pitching at least 40 innings in a month, with a WHIP of 0.51 in April 1909.

Interpreted as:

the best whip by a player in a month,minimum 40 innings pitched

	NAME	WHIP	IP	MONTH	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	BABIP	RA	H/9
1	Frank Smith F. Smith	0.51	45.0	April 1909	5	4	1	.800	5		15	5	1	0	21		5	0	2	2	0		162	0	3.00	0.40	7.50	0.00	9.3	1.2	.147	1.00	4.20
2	Clayton Kershaw C. Kershaw	0.52	49.2	May 2016	6	5	0	1.000	6	0.91	65	3	3	0	24	5	5	1	2	0	0	0	169	0	11.78	0.36	32.50	0.18	38.5	1.2	.228	0.91	4.35
3	Ferdie Schupp F. Schupp	0.53	60.0	September 1916	8	6	0	1.000	6	0.30	32	6	4	0	20	2	4	1	12	1	2		208	0	4.80	1.80	2.67	0.15	15.4	5.8	.117	0.60	3.00
4	Jesse Barnes J. Barnes	0.53	58.0	July 1919	7	7	0	1.000	6	1.09	24	5	2	0	25		10	2	6	0	1		207	1	3.72	0.93	4.00	0.31	11.6	2.9	.131	1.55	3.88
5	Jerry Reuss J. Reuss	0.55	44.0	June 1980	5	3	0	1.000	5	0.82	22	3	3	0	19	4	4	0	5	0	0	3	155	0	4.50	1.02	4.40	0.00	14.2	3.2	.148	0.82	3.89
6	Jack Flaherty J. Flaherty	0.57	44.0	September 2019	6	3	1	.750	6	0.82	53	0	0	0	17	4	4	2	8	1	0	0	153	2	10.84	1.64	6.63	0.41	34.6	5.2	.169	0.82	3.48
7	Felix Hernandez F. Hernandez	0.58	41.2	August 2012	5	4	0	1.000	5	1.08	31	3	3	0	19	5	6	1	5	1	0	0	146	0	6.70	1.08	6.20	0.22	21.2	3.4	.167	1.30	4.10
8	Elmer Steele E. Steele	0.58	41.1	August 1908	6	2	1	.667	4		13	3	1	0	21		7	0	3	0	1		145	0	2.83	0.65	4.33	0.00	9.0	2.1	.163	1.52	4.57
9	Mike Witt M. Witt	0.58	43.0	August 1986	5	5	0	1.000	5	0.21	28	3	1	0	17	1	4	1	8	0	0	0	155	0	5.86	1.67	3.50	0.21	18.1	5.2	.136	0.84	3.56
10	Tarik Skubal T. Skubal	0.59	41.0	May 2025	6	2	0	1.000	6	2.20	59	1	1	0	22	10	10	3	2	2	0	0	146	1	12.95	0.44	29.50	0.66	40.4	1.4	.238	2.20	4.83
11	Orel Hershiser O. Hershiser	0.59	46.0	July 1984	6	4	1	.800	5	0.78	48	4	4	0	20	4	4	1	7	1	0	1	165	1	9.39	1.37	6.86	0.20	29.1	4.2	.176	0.78	3.91
12	Clayton Kershaw C. Kershaw	0.60	47.0	July 2013	6	4	1	.800	6	1.34	43	1	1	0	26	7	7	2	2	1	0	0	168	3	8.23	0.38	21.50	0.38	25.6	1.2	.200	1.34	4.98
13	Jake Arrieta J. Arrieta	0.60	40.0	September 2015	5	4	0	1.000	5	0.45	39	1	1	0	20	2	3	1	4	1	0	0	140	1	8.78	0.90	9.75	0.23	27.9	2.9	.200	0.68	4.50
14	R.A. Dickey	0.60	48.1	June 2012	6	5	0	1.000	6	0.93	55	3	2	0	21	5	6	1	8	2	0	0	171	1	10.24	1.49	6.88	0.19	32.2	4.7	.190	1.12	3.91
15	Pedro Martinez P. Martinez	0.62	45.0	August 2000	6	3	1	.750	6	2.60	51	3	1	0	26	13	13	3	2	2	0	0	161	0	10.20	0.40	25.50	0.60	31.7	1.2	.223	2.60	5.20
16	Eddie Cicotte E. Cicotte	0.62	57.2	May 1917	10	6	1	.857	5	0.31	25	5	2	2	27	2	3	0	9	0	4		201	0	3.90	1.40	2.78	0.00	12.4	4.5	.162	0.47	4.21
17	Corey Kluber C. Kluber	0.63	46.0	August 2017	6	5	1	.833	6	1.96	54	2	0	0	23	10	10	6	6	2	0	0	166	0	10.57	1.17	9.00	1.17	32.5	3.6	.173	1.96	4.50
18	Madison Bumgarner M. Bumgarner	0.63	46.0	August 2014	6	4	1	.800	6	1.57	56	3	2	0	26	8	9	4	3	1	0	0	164	0	10.96	0.59	18.67	0.78	34.1	1.8	.220	1.76	5.09
19	Johan Santana J. Santana	0.63	46.0	July 2004	6	3	2	.600	6	1.17	61	1	1	0	14	6	7	4	15	2	0	0	165	3	11.93	2.93	4.07	0.78	37.0	9.1	.120	1.37	2.74
20	Pedro Martinez P. Martinez	0.63	41.0	September 1999	5	4	0	1.000	5	0.88	70	2	1	0	20	4	5	1	6	3	0	0	150	1	15.37	1.32	11.67	0.22	46.7	4.0	.271	1.10	4.39
21	Don Sutton D. Sutton	0.63	41.0	September 1981	5	4	1	.800	5	1.10	22	3	2	0	23	5	8	3	3	0	0	0	147	0	4.83	0.66	7.33	0.66	15.0	2.0	.168	1.76	5.05
22	Grover Alexander G. Alexander	0.64	74.0	June 1915	8	6	0	1.000	8	1.34	52	7	2	0	35	11	14	1	12	2	0		267	1	6.32	1.46	4.33	0.12	19.5	4.5	.170	1.70	4.26
23	Ed Walsh E. Walsh	0.64	84.2	June 1910	10	5	4	.556	7		41	7	1	1	44		16	0	10	2	3			1	4.36	1.06	4.10	0.00		3.2	.167	1.70	4.68
24	Christy Mathewson C. Mathewson	0.64	42.1	April 1908	5	4	0	1.000	4		36	4	2	0	23		5	0	4	0	0		158	0	7.65	0.85	9.00	0.00	22.8	2.5	.195	1.06	4.89
25	Christy Mathewson C. Mathewson	0.64	47.0	June 1909	8	7	0	1.000	6		29	4	2	1	25		6	1	5	0	2		164	0	5.55	0.96	5.80	0.19	17.7	3.0	.186	1.15	4.79