Extreme rain in United States, 5 to 25 August 2021

Name: Extreme rain in United States, 5 to 25 August 2021
Start: 2021-08-05
End: 2021-08-25
Location: United States

Extreme rain in United States, 5 to 25 August 2021: 857 records at 734 stations, peak on 18 August 2021. Closed.

Data as of 2026-10-18. Last revised 18 October 2026 (2026-10-18).

Key Facts

Extreme rain in United States, 5 to 25 August 2021 set or tied 857 station records at 734 stations.
It ran from 5 August 2021 to 25 August 2021 (21 days) and its peak day was 18 August 2021.
Status: closed.
Ann Arbor U of Mich set a daily record precipitation of 93.7 mm (3.7 in) on 12 August 2021.
The busiest day was 18 August 2021 with 138 records.
The oldest broken record in the ranked list had stood for 167 years.

Footprint

5 to 25 August 2021

The area covered by Extreme rain in United States, 5 to 25 August 2021 is outlined, with 20 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 5 to 25 August 2021: stations that set records in the event
Station	Type	Value	Date
Ann Arbor U of Mich	Record daily precipitation	93.7 mm (3.7 in)	2021-08-12
Cullowhee	Record daily precipitation	77.7 mm (3.1 in)	2021-08-18
Tyler Pounds Fld	Record daily precipitation	120.7 mm (4.8 in)	2021-08-18
E Stroudsburg	Record daily precipitation	122.9 mm (4.8 in)	2021-08-22
Langdon Exp Farm	Record daily precipitation	83.1 mm (3.3 in)	2021-08-10
Cornelia	Record daily precipitation	149.1 mm (5.9 in)	2021-08-18
Dickson	Record daily precipitation	294.6 mm (11.6 in)	2021-08-21
Green Bay	Record daily precipitation	86.9 mm (3.4 in)	2021-08-08
Decatur	Record daily precipitation	100.6 mm (4.0 in)	2021-08-19
Elizabethton	Record daily precipitation	63.8 mm (2.5 in)	2021-08-18
Elmira Corning Rgnl AP	Record daily precipitation	84.8 mm (3.3 in)	2021-08-18
Dansville	Record daily precipitation	66.0 mm (2.6 in)	2021-08-19
Cleveland	Record daily precipitation	131.1 mm (5.2 in)	2021-08-18
Rome	Record daily precipitation	84.1 mm (3.3 in)	2021-08-18
Highlands	Record daily precipitation	115.6 mm (4.6 in)	2021-08-18
Camden	Record daily precipitation	65.5 mm (2.6 in)	2021-08-19
Skaneateles	Record daily precipitation	84.1 mm (3.3 in)	2021-08-19
Waynesville 1 E	Record daily precipitation	80.5 mm (3.2 in)	2021-08-18
Boonville 4 SSW	Record daily precipitation	75.2 mm (3.0 in)	2021-08-19
Auburn	Record daily precipitation	76.5 mm (3.0 in)	2021-08-19

Records per Day

Peak day 138

Records set or tied each day from 5 August 2021 to 25 August 2021. The most in one day was 138 on 18 August 2021.

Records per day during Extreme rain in United States, 5 to 25 August 2021
Date	Records
2021-08-05	3
2021-08-06	4
2021-08-07	21
2021-08-08	43
2021-08-09	43
2021-08-10	29
2021-08-11	23
2021-08-12	42
2021-08-13	44
2021-08-14	33
2021-08-15	42
2021-08-16	46
2021-08-17	56
2021-08-18	138
2021-08-19	129
2021-08-20	44
2021-08-21	26
2021-08-22	38
2021-08-23	35
2021-08-24	17
2021-08-25	1

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 5 to 25 August 2021 ranked by margin
Dickson, 08-21	109.2 mm (4.3 in)
Tyler Pounds Fld, 08-18	87.7 mm (3.5 in)
Cleveland, 08-18	84.6 mm (3.3 in)
Cornelia, 08-18	73.4 mm (2.9 in)
Decatur, 08-19	67.3 mm (2.6 in)
Highlands, 08-18	63.3 mm (2.5 in)
Green Bay, 08-08	62.0 mm (2.4 in)
E Stroudsburg, 08-22	61.9 mm (2.4 in)
Elmira Corning Rgnl AP, 08-18	58.6 mm (2.3 in)
Langdon Exp Farm, 08-10	57.7 mm (2.3 in)
Boonville 4 SSW, 08-19	48.3 mm (1.9 in)
Camden, 08-19	48.0 mm (1.9 in)
Ann Arbor U of Mich, 08-12	46.5 mm (1.8 in)
Cullowhee, 08-18	45.9 mm (1.8 in)
Rome, 08-18	42.7 mm (1.7 in)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

500 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.

Margin against age of the broken record in Extreme rain in United States, 5 to 25 August 2021
Margin (mm)	Years the old record stood
47	112
46	100
88	118
62	88
73	82
58	82
109	11
62	71
67	68
40	71
33	100
59	71
85	71
43	87
48	71
43	64
63	82
48	71
36	82
35	71
36	76
45	82
42	68
35	131
38	27
38	71
28	96
50	48
46	48
57	60
41	71
23	122
31	50
36	106
27	120
16	87
58	52
70	12
54	71
42	68
40	64
34	106
32	71
39	80
45	80
27	71
20	122
19	49
61	46
40	48
50	42
82	39
55	27
81	28
48	48
33	112
29	42
36	74
54	51
32	78
52	42
23	120
30	67
8	118
29	71
51	44
23	121
26	88
26	100
81	23
63	20
70	24
28	75
27	90
62	16
20	84
76	36
52	15
42	36
41	40
44	42
57	12
75	20
83	10
15	99
16	120
16	120
64	22
22	87
33	82
70	27
36	58
3	112
82	8
19	110
61	36
24	167
7	92
4	112
20	106
47	30
60	12
81	4
21	76
24	64
60	19
119	8
43	42
53	11
99	11
53	6
65	12
40	34
28	84
42	47
32	64
37	70
18	87
11	100
47	12
33	48
15	87
60	7
24	74
15	106
55	14
15	125
19	84
57	27
18	68
16	144
27	55
25	64
37	24
31	56
39	31
27	79
64	15
16	91
38	27
10	64
11	72
22	33
30	56
17	62
9	102
5	78
9	111
16	91
9	96
22	82
9	116
12	88
24	74
8	115
33	52
8	116
27	72
7	108
6	126
45	27
14	82
40	10
65	4
32	48
39	11
30	36
28	30
29	59
6	112
21	54
25	66
8	96
72	10
50	20
124	4
24	60
37	14
9	34
7	100
43	24
58	16
50	11
12	84
50	2
22	56
44	23
7	95
33	27
7	132
19	64
4	120
26	52
20	66
11	74
20	68
19	50
7	58
4	120
6	96

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 5 to 25 August 2021 compared with similar events
Extreme rain in United States and Mexico, 23 February to 15 March 2019	2,223 records
Extreme rain in United States, 3 to 19 January 2024	2,133 records
Extreme rain in Australia, 7 to 26 March 2021	2,099 records
Extreme rain in United States and Mexico, 29 September to 19 October 2018	1,970 records
Extreme rain in United States, 19 December 2022 to 13 January 2023	1,941 records
Extreme rain in United States, 5 to 25 August 2021 (this event)	857 records

Every Record Set

20 of 857

Every record set or tied during Extreme rain in United States, 5 to 25 August 2021, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2021-08-08	Green Bay	Record daily precipitation	86.9 mm (3.4 in)	62.0 mm (2.4 in)	71	71 of 100 (Major)
2021-08-10	Langdon Exp Farm	Record daily precipitation	83.1 mm (3.3 in)	57.7 mm (2.3 in)	82	74 of 100 (Major)
2021-08-12	Ann Arbor U of Mich	Record daily precipitation	93.7 mm (3.7 in)	46.5 mm (1.8 in)	112	80 of 100 (Exceptional)
2021-08-18	Cullowhee	Record daily precipitation	77.7 mm (3.1 in)	45.9 mm (1.8 in)	100	80 of 100 (Exceptional)
2021-08-18	Tyler Pounds Fld	Record daily precipitation	120.7 mm (4.8 in)	87.7 mm (3.5 in)	118	80 of 100 (Exceptional)
2021-08-18	Cornelia	Record daily precipitation	149.1 mm (5.9 in)	73.4 mm (2.9 in)	82	74 of 100 (Major)
2021-08-18	Elizabethton	Record daily precipitation	63.8 mm (2.5 in)	33.3 mm (1.3 in)	100	69 of 100 (Major)
2021-08-18	Elmira Corning Rgnl AP	Record daily precipitation	84.8 mm (3.3 in)	58.6 mm (2.3 in)	71	69 of 100 (Major)
2021-08-18	Cleveland	Record daily precipitation	131.1 mm (5.2 in)	84.6 mm (3.3 in)	71	68 of 100 (Major)
2021-08-18	Rome	Record daily precipitation	84.1 mm (3.3 in)	42.7 mm (1.7 in)	87	67 of 100 (Major)
2021-08-18	Highlands	Record daily precipitation	115.6 mm (4.6 in)	63.3 mm (2.5 in)	82	67 of 100 (Major)
2021-08-18	Waynesville 1 E	Record daily precipitation	80.5 mm (3.2 in)	35.8 mm (1.4 in)	82	66 of 100 (Major)
2021-08-19	Decatur	Record daily precipitation	100.6 mm (4.0 in)	67.3 mm (2.6 in)	68	70 of 100 (Major)
2021-08-19	Dansville	Record daily precipitation	66.0 mm (2.6 in)	40.1 mm (1.6 in)	71	69 of 100 (Major)
2021-08-19	Camden	Record daily precipitation	65.5 mm (2.6 in)	48.0 mm (1.9 in)	71	67 of 100 (Major)
2021-08-19	Skaneateles	Record daily precipitation	84.1 mm (3.3 in)	42.7 mm (1.7 in)	64	67 of 100 (Major)
2021-08-19	Boonville 4 SSW	Record daily precipitation	75.2 mm (3.0 in)	48.3 mm (1.9 in)	71	66 of 100 (Major)
2021-08-19	Auburn	Record daily precipitation	76.5 mm (3.0 in)	35.4 mm (1.4 in)	71	65 of 100 (Major)
2021-08-21	Dickson	Record daily precipitation	294.6 mm (11.6 in)	109.2 mm (4.3 in)	11	73 of 100 (Major)
2021-08-22	E Stroudsburg	Record daily precipitation	122.9 mm (4.8 in)	61.9 mm (2.4 in)	88	76 of 100 (Major)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 857 records the event counts. The counts above use the full total.

Related Headlines

Third party news, headline and link only

Download the Data

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-18. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.

Margin (mm)	Years the old record stood
47	112
46	100
88	118
62	88
73	82
58	82
109	11
62	71
67	68
40	71
33	100
59	71
85	71
43	87
48	71
43	64
63	82
48	71
36	82
35	71
36	76
45	82
42	68
35	131
38	27
38	71
28	96
50	48
46	48
57	60
41	71
23	122
31	50
36	106
27	120
16	87
58	52
70	12
54	71
42	68
40	64
34	106
32	71
39	80
45	80
27	71
20	122
19	49
61	46
40	48
50	42
82	39
55	27
81	28
48	48
33	112
29	42
36	74
54	51
32	78
52	42
23	120
30	67
8	118
29	71
51	44
23	121
26	88
26	100
81	23
63	20
70	24
28	75
27	90
62	16
20	84
76	36
52	15
42	36
41	40
44	42
57	12
75	20
83	10
15	99
16	120
16	120
64	22
22	87
33	82
70	27
36	58
3	112
82	8
19	110
61	36
24	167
7	92
4	112
20	106
47	30
60	12
81	4
21	76
24	64
60	19
119	8
43	42
53	11
99	11
53	6
65	12
40	34
28	84
42	47
32	64
37	70
18	87
11	100
47	12
33	48
15	87
60	7
24	74
15	106
55	14
15	125
19	84
57	27
18	68
16	144
27	55
25	64
37	24
31	56
39	31
27	79
64	15
16	91
38	27
10	64
11	72
22	33
30	56
17	62
9	102
5	78
9	111
16	91
9	96
22	82
9	116
12	88
24	74
8	115
33	52
8	116
27	72
7	108
6	126
45	27
14	82
40	10
65	4
32	48
39	11
30	36
28	30
29	59
6	112
21	54
25	66
8	96
72	10
50	20
124	4
24	60
37	14
9	34
7	100
43	24
58	16
50	11
12	84
50	2
22	56
44	23
7	95
33	27
7	132
19	64
4	120
26	52
20	66
11	74
20	68
19	50
7	58
4	120
6	96

Margin (mm)	Years the old record stood
47	112
46	100
88	118
62	88
73	82
58	82
109	11
62	71
67	68
40	71
33	100
59	71
85	71
43	87
48	71
43	64
63	82
48	71
36	82
35	71
36	76
45	82
42	68
35	131
38	27
38	71
28	96
50	48
46	48
57	60
41	71
23	122
31	50
36	106
27	120
16	87
58	52
70	12
54	71
42	68
40	64
34	106
32	71
39	80
45	80
27	71
20	122
19	49
61	46
40	48
50	42
82	39
55	27
81	28
48	48
33	112
29	42
36	74
54	51
32	78
52	42
23	120
30	67
8	118
29	71
51	44
23	121
26	88
26	100
81	23
63	20
70	24
28	75
27	90
62	16
20	84
76	36
52	15
42	36
41	40
44	42
57	12
75	20
83	10
15	99
16	120
16	120
64	22
22	87
33	82
70	27
36	58
3	112
82	8
19	110
61	36
24	167
7	92
4	112
20	106
47	30
60	12
81	4
21	76
24	64
60	19
119	8
43	42
53	11
99	11
53	6
65	12
40	34
28	84
42	47
32	64
37	70
18	87
11	100
47	12
33	48
15	87
60	7
24	74
15	106
55	14
15	125
19	84
57	27
18	68
16	144
27	55
25	64
37	24
31	56
39	31
27	79
64	15
16	91
38	27
10	64
11	72
22	33
30	56
17	62
9	102
5	78
9	111
16	91
9	96
22	82
9	116
12	88
24	74
8	115
33	52
8	116
27	72
7	108
6	126
45	27
14	82
40	10
65	4
32	48
39	11
30	36
28	30
29	59
6	112
21	54
25	66
8	96
72	10
50	20
124	4
24	60
37	14
9	34
7	100
43	24
58	16
50	11
12	84
50	2
22	56
44	23
7	95
33	27
7	132
19	64
4	120
26	52
20	66
11	74
20	68
19	50
7	58
4	120
6	96

Margin (mm)	Years the old record stood
47	112
46	100
88	118
62	88
73	82
58	82
109	11
62	71
67	68
40	71
33	100
59	71
85	71
43	87
48	71
43	64
63	82
48	71
36	82
35	71
36	76
45	82
42	68
35	131
38	27
38	71
28	96
50	48
46	48
57	60
41	71
23	122
31	50
36	106
27	120
16	87
58	52
70	12
54	71
42	68
40	64
34	106
32	71
39	80
45	80
27	71
20	122
19	49
61	46
40	48
50	42
82	39
55	27
81	28
48	48
33	112
29	42
36	74
54	51
32	78
52	42
23	120
30	67
8	118
29	71
51	44
23	121
26	88
26	100
81	23
63	20
70	24
28	75
27	90
62	16
20	84
76	36
52	15
42	36
41	40
44	42
57	12
75	20
83	10
15	99
16	120
16	120
64	22
22	87
33	82
70	27
36	58
3	112
82	8
19	110
61	36
24	167
7	92
4	112
20	106
47	30
60	12
81	4
21	76
24	64
60	19
119	8
43	42
53	11
99	11
53	6
65	12
40	34
28	84
42	47
32	64
37	70
18	87
11	100
47	12
33	48
15	87
60	7
24	74
15	106
55	14
15	125
19	84
57	27
18	68
16	144
27	55
25	64
37	24
31	56
39	31
27	79
64	15
16	91
38	27
10	64
11	72
22	33
30	56
17	62
9	102
5	78
9	111
16	91
9	96
22	82
9	116
12	88
24	74
8	115
33	52
8	116
27	72
7	108
6	126
45	27
14	82
40	10
65	4
32	48
39	11
30	36
28	30
29	59
6	112
21	54
25	66
8	96
72	10
50	20
124	4
24	60
37	14
9	34
7	100
43	24
58	16
50	11
12	84
50	2
22	56
44	23
7	95
33	27
7	132
19	64
4	120
26	52
20	66
11	74
20	68
19	50
7	58
4	120
6	96