Precipitation annual maximum series (inches)
Station ID: 11-1549
Station name: CHICAGO O'HARE WSO ARP
State: IL
Latitude (decimal degrees): 41.9950
Longitude (decimal degrees): 87.9336
Elevation (feet): 658

Duration: 01d
2.08	1940
2.36	1941
1.56	1942
4.03	1943
1.32	1944
1.76	1945
3.12	1946
2.85	1947
-9.99	1948
-9.99	1949
-9.99	1950
1.74	1951
1.92	1952
1.61	1953
4.86	1954
2.64	1955
1.89	1956
6.11	1957
1.61	1958
1.33	1959
2.00	1960
2.88	1961
2.84	1962
1.98	1963
2.33	1964
1.77	1965
2.69	1966
3.09	1967
3.43	1968
4.25	1969
2.11	1970
2.30	1971
2.55	1972
2.03	1973
1.58	1974
3.48	1975
2.09	1976
1.92	1977
2.83	1978
2.24	1979
1.96	1980
3.45	1981
4.47	1982
2.81	1983
1.68	1984
2.74	1985
1.78	1986
6.49	1987
3.61	1988
3.47	1989
3.14	1990
2.57	1991
1.64	1992
2.90	1993
2.69	1994
2.37	1995
2.10	1996
3.44	1997
2.69	1998
1.96	1999
2.37	2000

Duration: 01h
07/02/1962	1.45
08/03/1963	1.07
07/18/1964	1.32
07/13/1965	1.59
04/20/1966	0.90
06/10/1967	1.65
08/16/1968	0.94
09/05/1969	1.32
07/19/1970	0.97
08/24/1971	1.72
08/25/1972	1.65
04/30/1973	0.80
04/03/1974	0.89
08/21/1975	1.22
03/02/1976	0.98
09/25/1977	1.07
09/13/1978	2.00
08/29/1979	1.10
08/16/1980	1.44
05/29/1981	1.51
12/24/1982	1.29
06/10/1983	0.91
07/20/1984	1.41
08/13/1985	1.55
10/03/1986	0.98
08/14/1987	1.94
10/17/1988	1.35
09/01/1989	1.85
08/18/1990	1.55
05/16/1991	0.85
09/15/1992	1.19
07/18/1993	1.26
06/23/1994	0.97
08/16/1995	1.08
07/17/1996	0.57
07/18/1997	1.75
08/05/1998	1.38
07/21/1999	1.22
07/02/2000	0.95

Duration: 02d
2.14	1940
2.45	1941
2.68	1942
4.03	1943
1.69	1944
2.49	1945
3.26	1946
2.85	1947
-9.99	1948
-9.99	1949
-9.99	1950
2.79	1951
2.58	1952
1.61	1953
5.54	1954
3.60	1955
2.96	1956
6.43	1957
1.62	1958
2.34	1959
2.15	1960
3.97	1961
2.89	1962
2.32	1963
2.39	1964
2.06	1965
3.10	1966
3.09	1967
3.67	1968
4.66	1969
2.52	1970
2.30	1971
2.77	1972
2.21	1973
1.64	1974
3.80	1975
2.90	1976
1.92	1977
3.18	1978
2.24	1979
2.76	1980
3.45	1981
4.62	1982
3.16	1983
1.68	1984
2.92	1985
2.03	1986
9.35	1987
3.64	1988
4.24	1989
3.94	1990
2.84	1991
2.12	1992
2.90	1993
3.80	1994
2.58	1995
2.66	1996
4.07	1997
3.10	1998
2.64	1999
3.00	2000

Duration: 02h
07/02/1962	1.77
09/02/1963	1.16
07/18/1964	1.38
07/13/1965	1.73
04/20/1966	1.10
06/10/1967	2.35
08/16/1968	1.58
10/10/1969	1.88
06/12/1970	1.59
08/24/1971	2.22
08/25/1972	1.95
04/30/1973	1.29
04/03/1974	1.09
04/18/1975	1.43
03/02/1976	1.20
09/25/1977	1.13
09/13/1978	2.33
08/29/1979	1.40
08/16/1980	2.09
05/29/1981	2.31
12/02/1982	1.95
05/22/1983	1.14
07/20/1984	1.63
08/13/1985	1.59
10/03/1986	1.43
08/14/1987	3.09
10/17/1988	1.92
08/04/1989	3.03
08/18/1990	2.77
10/25/1991	1.02
09/15/1992	1.25
07/18/1993	1.86
06/23/1994	1.33
07/04/1995	1.51
07/17/1996	0.87
07/18/1997	1.75
08/05/1998	1.66
07/21/1999	1.69
07/02/2000	1.09

Duration: 03h
07/02/1962	1.98
09/02/1963	1.31
07/18/1964	1.45
07/13/1965	1.75
04/20/1966	1.14
06/10/1967	2.76
08/16/1968	2.19
10/10/1969	2.28
06/12/1970	1.60
08/24/1971	2.30
04/16/1972	2.19
04/30/1973	1.33
04/03/1974	1.09
08/30/1975	1.55
03/02/1976	1.22
06/11/1977	1.36
09/13/1978	2.58
08/29/1979	1.50
08/16/1980	2.12
05/29/1981	2.67
12/02/1982	2.14
10/22/1983	1.40
07/20/1984	1.64
08/13/1985	1.64
10/03/1986	1.57
08/13/1987	3.32
10/17/1988	2.62
08/04/1989	3.26
08/18/1990	2.85
08/08/1991	1.11
09/15/1992	1.25
07/18/1993	1.86
06/23/1994	1.58
07/04/1995	1.63
07/17/1996	0.94
07/18/1997	1.84
08/05/1998	1.87
07/21/1999	1.78
07/02/2000	1.18

Duration: 04d
2.53	1940
2.72	1941
3.43	1942
4.19	1943
2.39	1944
2.87	1945
3.26	1946
2.85	1947
-9.99	1948
-9.99	1949
-9.99	1950
2.87	1951
2.58	1952
2.01	1953
5.58	1954
3.77	1955
3.87	1956
6.43	1957
1.62	1958
2.89	1959
2.68	1960
4.81	1961
2.91	1962
2.32	1963
2.39	1964
2.59	1965
3.17	1966
3.83	1967
3.69	1968
5.46	1969
3.56	1970
2.51	1971
3.59	1972
2.82	1973
2.27	1974
4.15	1975
3.80	1976
2.15	1977
3.38	1978
2.40	1979
3.52	1980
3.45	1981
5.37	1982
3.49	1983
2.58	1984
3.00	1985
2.77	1986
12.84	1987
3.74	1988
4.25	1989
5.27	1990
3.16	1991
3.00	1992
3.50	1993
3.80	1994
2.58	1995
2.93	1996
4.08	1997
3.51	1998
3.38	1999
3.22	2000

Duration: 06h
07/02/1962	2.73
07/13/1963	1.45
07/18/1964	1.87
07/13/1965	1.76
05/11/1966	1.43
06/10/1967	3.07
08/16/1968	3.43
10/10/1969	3.71
06/12/1970	1.60
08/24/1971	2.30
09/17/1972	2.55
09/24/1973	1.77
07/22/1974	1.24
08/30/1975	2.37
03/02/1976	1.22
06/30/1977	1.87
09/13/1978	2.74
08/29/1979	2.10
08/16/1980	2.45
05/29/1981	3.10
12/02/1982	3.16
10/22/1983	2.10
07/20/1984	1.68
08/13/1985	1.68
10/03/1986	1.71
08/13/1987	5.95
10/17/1988	3.30
08/04/1989	3.45
08/18/1990	2.85
08/08/1991	1.69
09/15/1992	1.25
08/15/1993	1.87
06/23/1994	2.64
07/04/1995	1.72
07/17/1996	1.37
02/21/1997	2.10
08/05/1998	1.87
07/21/1999	1.78
09/11/2000	1.29

Duration: 07d
2.85	1940
3.86	1941
4.95	1942
4.23	1943
2.53	1944
3.37	1945
3.26	1946
3.16	1947
-9.99	1948
-9.99	1949
-9.99	1950
3.44	1951
4.23	1952
3.35	1953
6.45	1954
3.92	1955
3.87	1956
6.68	1957
2.67	1958
3.15	1959
2.84	1960
4.81	1961
2.91	1962
3.77	1963
2.92	1964
2.84	1965
3.50	1966
4.42	1967
4.29	1968
5.53	1969
4.04	1970
4.06	1971
5.49	1972
3.35	1973
2.92	1974
4.15	1975
4.08	1976
3.21	1977
6.48	1978
2.89	1979
4.95	1980
4.02	1981
5.70	1982
4.26	1983
3.61	1984
3.24	1985
4.25	1986
13.12	1987
4.08	1988
5.05	1989
5.43	1990
3.55	1991
3.01	1992
4.10	1993
4.51	1994
2.62	1995
3.25	1996
4.67	1997
3.74	1998
3.70	1999
4.43	2000

Duration: 10d
3.03	1940
5.48	1941
6.24	1942
4.81	1943
2.53	1944
4.44	1945
3.54	1946
3.46	1947
-9.99	1948
-9.99	1949
-9.99	1950
3.66	1951
4.73	1952
3.35	1953
8.10	1954
5.26	1955
5.03	1956
7.17	1957
3.05	1958
3.27	1959
2.99	1960
5.96	1961
3.03	1962
3.80	1963
3.28	1964
3.45	1965
4.74	1966
5.12	1967
4.29	1968
5.93	1969
5.12	1970
4.25	1971
5.94	1972
4.36	1973
3.39	1974
6.11	1975
4.08	1976
3.33	1977
6.63	1978
3.57	1979
5.45	1980
4.02	1981
6.11	1982
4.77	1983
3.83	1984
4.36	1985
5.53	1986
13.68	1987
4.21	1988
5.83	1989
6.98	1990
3.95	1991
3.40	1992
4.77	1993
5.38	1994
3.19	1995
3.99	1996
5.10	1997
3.74	1998
4.38	1999
4.53	2000

Duration: 12h
07/02/1962	2.84
07/13/1963	1.95
07/18/1964	2.31
07/13/1965	1.76
05/11/1966	2.20
06/10/1967	3.09
08/16/1968	3.44
10/10/1969	4.11
07/29/1970	1.83
08/24/1971	2.30
09/17/1972	2.55
09/24/1973	2.16
07/22/1974	1.58
08/29/1975	3.19
04/25/1976	1.93
06/30/1977	1.92
09/12/1978	2.84
08/29/1979	2.24
08/16/1980	2.62
05/29/1981	3.10
12/02/1982	3.80
10/22/1983	2.50
07/20/1984	1.68
11/01/1985	2.18
10/02/1986	1.82
08/13/1987	8.35
10/17/1988	3.55
08/04/1989	3.45
05/09/1990	3.16
10/04/1991	2.11
09/15/1992	1.25
07/18/1993	2.76
06/23/1994	3.09
11/10/1995	2.06
07/17/1996	1.71
02/20/1997	3.12
10/17/1998	2.20
07/21/1999	1.78
09/11/2000	1.86

Duration: 20d
4.29	1940
7.20	1941
7.51	1942
8.60	1943
3.23	1944
6.76	1945
5.57	1946
6.18	1947
-9.99	1948
-9.99	1949
-9.99	1950
5.26	1951
6.07	1952
4.03	1953
8.79	1954
7.43	1955
7.05	1956
8.81	1957
5.05	1958
5.26	1959
4.46	1960
9.35	1961
3.93	1962
4.63	1963
4.56	1964
5.14	1965
6.77	1966
7.43	1967
5.31	1968
6.36	1969
7.89	1970
5.04	1971
7.70	1972
6.02	1973
5.24	1974
6.99	1975
6.10	1976
4.82	1977
7.36	1978
5.99	1979
8.08	1980
6.98	1981
8.60	1982
7.02	1983
4.22	1984
7.73	1985
7.95	1986
17.09	1987
5.68	1988
9.59	1989
7.72	1990
4.51	1991
4.35	1992
7.33	1993
6.09	1994
5.54	1995
6.72	1996
5.42	1997
4.76	1998
7.28	1999
5.10	2000

Duration: 24h
07/01/1962	2.89
04/29/1963	2.31
07/17/1964	2.39
12/24/1965	1.77
05/11/1966	2.88
06/10/1967	3.09
08/16/1968	3.44
10/10/1969	4.62
05/12/1970	2.41
08/24/1971	2.30
09/17/1972	2.77
09/24/1973	2.16
06/08/1974	1.61
08/29/1975	3.56
04/24/1976	2.76
06/30/1977	1.92
09/16/1978	3.00
08/29/1979	2.24
08/16/1980	2.76
05/29/1981	3.45
12/02/1982	4.53
10/21/1983	3.14
07/20/1984	1.68
10/31/1985	2.68
10/02/1986	1.82
08/13/1987	9.35
10/17/1988	3.61
08/04/1989	3.69
05/09/1990	3.34
10/03/1991	2.64
10/31/1992	1.64
07/18/1993	2.90
06/23/1994	3.79
11/10/1995	2.57
07/17/1996	2.33
02/20/1997	3.55
10/17/1998	2.93
12/04/1999	2.04
09/11/2000	1.86

Duration: 30d
5.06	1940
8.88	1941
8.45	1942
9.08	1943
4.11	1944
8.23	1945
5.67	1946
7.48	1947
-9.99	1948
-9.99	1949
-9.99	1950
6.50	1951
8.46	1952
4.93	1953
9.39	1954
8.03	1955
7.51	1956
11.22	1957
5.74	1958
6.03	1959
5.82	1960
11.44	1961
5.27	1962
5.96	1963
5.76	1964
6.50	1965
9.38	1966
8.25	1967
6.75	1968
7.76	1969
8.98	1970
5.52	1971
10.01	1972
7.28	1973
6.47	1974
7.37	1975
6.67	1976
6.69	1977
8.53	1978
7.57	1979
9.94	1980
7.84	1981
10.70	1982
9.22	1983
4.96	1984
8.41	1985
9.79	1986
17.73	1987
8.02	1988
10.91	1989
7.83	1990
7.43	1991
5.49	1992
9.96	1993
6.57	1994
6.19	1995
7.53	1996
6.24	1997
6.88	1998
7.69	1999
6.54	2000

Duration: 45d
6.24	1940
12.56	1941
10.11	1942
11.75	1943
5.92	1944
10.63	1945
6.92	1946
10.31	1947
-9.99	1948
-9.99	1949
-9.99	1950
8.23	1951
11.16	1952
5.64	1953
11.04	1954
8.73	1955
7.99	1956
12.19	1957
7.82	1958
8.19	1959
6.91	1960
12.61	1961
6.46	1962
6.61	1963
7.76	1964
8.89	1965
10.60	1966
9.29	1967
8.16	1968
9.62	1969
12.55	1970
6.53	1971
11.79	1972
8.32	1973
9.36	1974
8.87	1975
7.92	1976
8.82	1977
10.80	1978
9.49	1979
13.11	1980
10.02	1981
12.58	1982
11.76	1983
7.34	1984
12.03	1985
10.64	1986
20.13	1987
10.68	1988
12.92	1989
9.96	1990
8.63	1991
6.96	1992
13.10	1993
7.71	1994
9.12	1995
9.31	1996
7.27	1997
8.70	1998
10.82	1999
8.30	2000

Duration: 48h
07/01/1962	2.91
04/29/1963	2.32
07/17/1964	2.39
12/23/1965	2.13
05/11/1966	3.10
06/10/1967	3.53
08/15/1968	3.68
10/09/1969	4.69
05/12/1970	2.96
08/22/1971	2.44
09/17/1972	2.93
09/24/1973	2.21
06/08/1974	1.73
08/28/1975	4.08
04/23/1976	2.95
06/30/1977	1.92
09/16/1978	3.26
08/27/1979	2.25
08/16/1980	2.76
05/29/1981	3.45
12/02/1982	4.62
10/21/1983	3.21
07/20/1984	1.68
10/31/1985	3.00
10/02/1986	2.07
08/13/1987	9.94
10/15/1988	3.67
08/04/1989	4.24
08/18/1990	4.08
10/03/1991	2.85
10/31/1992	2.16
06/17/1993	3.38
06/23/1994	3.80
11/10/1995	2.58
07/17/1996	2.35
02/20/1997	3.84
08/03/1998	3.47
06/11/1999	2.89
04/19/2000	2.10

Duration: 60d
8.85	1940
14.61	1941
11.32	1942
15.45	1943
7.05	1944
12.54	1945
8.34	1946
13.86	1947
-9.99	1948
-9.99	1949
-9.99	1950
10.64	1951
12.05	1952
7.39	1953
12.59	1954
10.25	1955
9.24	1956
14.79	1957
8.87	1958
8.79	1959
9.48	1960
14.90	1961
8.14	1962
8.20	1963
9.37	1964
11.44	1965
13.49	1966
10.21	1967
10.88	1968
11.31	1969
15.35	1970
7.93	1971
15.11	1972
9.47	1973
11.13	1974
10.65	1975
10.24	1976
11.53	1977
11.33	1978
10.18	1979
15.70	1980
13.21	1981
15.69	1982
13.99	1983
8.62	1984
14.15	1985
10.98	1986
21.42	1987
11.73	1988
16.56	1989
12.25	1990
10.95	1991
9.01	1992
15.11	1993
10.05	1994
10.31	1995
10.34	1996
9.08	1997
9.63	1998
14.58	1999
11.38	2000