Four of the 48 continental US states set a record for lowest rainfall in September 2012 according to the NOAA. The ranks are out of 118 with 1 being driest. 19 out of the 48 states were below average (rank 59 and lower) and 29 were ranked above average.

Indiana, Kentucky, Mississippi, Missouri, Tennessee and Nebraska’s driest September were before 1900.

State	Sep 2012	Sep Rank	Driest Sep	Lowest Rainfall	Wettest Sep	Highest Rainfall
Minnesota	0.56	1	2012	0.56	2010	6.7
Montana	0.15	1	2012	0.15	1986	3.71
North Dakota	0.24	1	2012	0.24	1900	5
South Dakota	0.24	1	2012	0.24	1986	4.27
Washington	0.11	2	1975	0.09	1959	4.78
Nebraska	0.51	3	1899	0.44	1973	6.5
Oregon	0.07	4	1999	0.03	1986	2.83
Idaho	0.19	7	1987	0.08	1959	3.23
Wisconsin	1.61	9	1952	0.78	1986	8.25
Wyoming	0.31	9	1979	0.22	1923	3.42
Iowa	1.62	15	1939	0.84	1926	9.75
California	0.1	24	1974	0.02	1904	2.42
South Carolina	2.36	24	2005	0.81	1928	13.12
Georgia	2.77	33	2005	0.93	2004	12.32
Michigan	2.69	36	1979	0.98	1986	8.62
Kansas	2.08	39	1956	0.29	1973	8.35
Florida	5.66	42	1921	2.13	1979	12.98
Oklahoma	2.9	55	1956	0.27	1945	7.86
New Mexico	1.49	58	1956	0.08	1941	5.84
Utah	0.85	61	1979	0.04	1982	3.71
Arizona	1.18	63	1953	0.02	1939	4.14
New Jersey	3.97	71	1941	0.27	1938	9.78
Colorado	1.4	72	1956	0.1	1961	2.93
Delaware	4.09	74	1941	0.15	1935	11.59
North Carolina	4.89	77	1990	1.22	1999	13.3
Maryland	4.16	81	1941	0.58	1999	10.45
Mississippi	4.15	85	1897	0.72	1906	10.06
Virginia	4.08	85	2005	0.79	1999	10.47
Nevada	0.69	90	1922	0.02	1982	2.57
Missouri	5.23	92	1897	0.7	1993	11.65
Rhode Island	5.2	92	1941	0.5	2008	9.51
Texas	4.01	92	1931	0.55	1936	6.9
Alabama	5.55	95	1984	0.66	1906	10.03
Maine	4.95	97	1948	1.26	1999	9.1
Massachusetts	5.32	97	1914	0.58	1933	9.66
Arkansas	5.19	98	2004	0.41	1913	9.94
Louisiana	6.01	98	1953	0.96	1913	12.92
Vermont	5.08	98	1908	0.96	1999	8.61
New Hampshire	5.46	99	1914	0.77	1938	9.81
New York	4.8	99	1964	1.18	1977	7.87
Connecticut	5.96	100	1914	0.35	1938	13.89
Pennsylvania	5.21	103	1943	0.79	2011	10.08
Illinois	5.12	104	1979	0.49	1926	9.68
Indiana	5.2	105	1897	0.6	1926	8.25
Tennessee	6.02	107	1897	0.6	1977	7.86
West Virginia	5.45	108	1985	0.69	2004	7.45
Kentucky	5.99	112	1897	0.28	2006	8.55
Ohio	5.57	115	1908	0.58	1926	7.16

The 1940-1959 period has the largest number of driest Septembers.