Iowa May Precipitation by Year

This page is a list of the average statewide precipitation in the month of May in Iowa for each year from 1895–2023. It is a statewide average over the entire territory of the state, based on data from the NOAA.

State:

Month:

What Was the Rainiest May in Iowa History?

2013 was the wettest May in Iowa history with an average monthly statewide precipitation of 8.65 inches.

What Was the Driest May in Iowa History?

1934 was the driest May in Iowa history with an average monthly statewide precipitation of 0.96 inches.

Click column headers to sort

Year	Rank	Precipitation (in)
2023	108	2.67
2022	77	3.62
2021	68	3.87
2020	47	4.57
2019	3	8.21
2018	43	4.70
2017	38	4.80
2016	53	4.36
2015	31	5.06
2014	96	3.04
2013	1	8.65
2012	82	3.51
2011	32	5.00
2010	59	4.19
2009	76	3.64
2008	23	5.67
2007	29	5.35
2006	114	2.44
2005	70	3.85
2004	5	7.74
2003	46	4.61
2002	60	4.10
2001	9	7.04
2000	78	3.60
1999	36	4.89
1998	55	4.30
1997	61	4.03
1996	8	7.34
1995	21	5.88
1994	120	2.05
1993	25	5.60
1992	126	1.75
1991	30	5.19
1990	22	5.73
1989	111	2.57
1988	125	1.77
1987	63	3.97
1986	24	5.62
1985	101	2.80
1984	39	4.76
1983	44	4.69
1982	10	7.03
1981	112	2.54
1980	100	2.83
1979	97	2.91
1978	74	3.76
1977	104	2.77
1976	90	3.20
1975	86	3.30
1974	14	6.27
1973	18	6.04
1972	48	4.57
1971	81	3.57
1970	34	4.95
1969	71	3.82
1968	107	2.69
1967	105	2.74
1966	69	3.87
1965	40	4.76
1964	62	4.01
1963	99	2.86
1962	26	5.55
1961	115	2.40
1960	20	5.89
1959	6	7.58
1958	123	2.00
1957	35	4.94
1956	88	3.28
1955	106	2.71
1954	73	3.80
1953	118	2.37
1952	72	3.82
1951	33	4.98
1950	37	4.89
1949	109	2.67
1948	119	2.31
1947	58	4.23
1946	50	4.52
1945	16	6.16
1944	15	6.22
1943	54	4.35
1942	45	4.67
1941	93	3.16
1940	122	2.02
1939	121	2.04
1938	28	5.49
1937	64	3.97
1936	102	2.78
1935	49	4.53
1934	129	0.96
1933	57	4.24
1932	65	3.92
1931	98	2.91
1930	75	3.76
1929	116	2.39
1928	113	2.49
1927	42	4.72
1926	110	2.64
1925	128	1.15
1924	127	1.68
1923	103	2.78
1922	83	3.47
1921	56	4.30
1920	87	3.30
1919	95	3.07
1918	11	6.85
1917	67	3.91
1916	41	4.75
1915	7	7.35
1914	85	3.31
1913	13	6.33
1912	92	3.17
1911	66	3.92
1910	89	3.28
1909	52	4.37
1908	4	8.12
1907	79	3.59
1906	84	3.42
1905	17	6.09
1904	80	3.59
1903	2	8.55
1902	27	5.54
1901	117	2.39
1900	94	3.13
1899	19	6.04
1898	51	4.47
1897	124	1.89
1896	12	6.47
1895	91	3.20