Extreme rain in United States, 20 to 31 October 2021

Name: Extreme rain in United States, 20 to 31 October 2021
Start: 2021-10-20
End: 2021-10-31
Location: United States

Extreme rain in United States, 20 to 31 October 2021: 1,655 records at 1,373 stations, peak on 25 October 2021. Closed.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Key Facts

Extreme rain in United States, 20 to 31 October 2021 set or tied 1,655 station records at 1,373 stations.
It ran from 20 October 2021 to 31 October 2021 (12 days) and its peak day was 25 October 2021.
Status: closed.
Saint Helena set an all-time record daily precipitation of 252.2 mm (9.9 in) on 24 October 2021.
The busiest day was 25 October 2021 with 525 records.
The oldest broken record in the ranked list had stood for 141 years.

Footprint

20 to 31 October 2021

The area covered by Extreme rain in United States, 20 to 31 October 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, 20 to 31 October 2021: stations that set records in the event
Station	Type	Value	Date
Saint Helena	Record daily precipitation	252.2 mm (9.9 in)	2021-10-24
Hill City 1 W	Record daily precipitation	66.3 mm (2.6 in)	2021-10-25
Portola	Record daily precipitation	144.0 mm (5.7 in)	2021-10-25
Sacramento AP ASOS	Record daily precipitation	137.4 mm (5.4 in)	2021-10-24
Steffenville	Record daily precipitation	110.2 mm (4.3 in)	2021-10-24
Maquoketa	Record daily precipitation	70.9 mm (2.8 in)	2021-10-25
Marshalltown	Record daily precipitation	71.6 mm (2.8 in)	2021-10-25
Ely AP	Record daily precipitation	26.7 mm (1.1 in)	2021-10-25
Belle Plaine	Record daily precipitation	65.5 mm (2.6 in)	2021-10-25
Boca	Record daily precipitation	119.9 mm (4.7 in)	2021-10-25
Camp Pardee	Record daily precipitation	126.2 mm (5.0 in)	2021-10-24
Piqua	Record daily precipitation	69.9 mm (2.8 in)	2021-10-25
Newman	Record daily precipitation	37.8 mm (1.5 in)	2021-10-25
Sutter Hill Cdf	Record daily precipitation	137.2 mm (5.4 in)	2021-10-25
Carson City	Record daily precipitation	71.4 mm (2.8 in)	2021-10-25
Topaz Lake	Record daily precipitation	55.1 mm (2.2 in)	2021-10-25
Philo	Record daily precipitation	47.5 mm (1.9 in)	2021-10-25
Peru	Record daily precipitation	48.8 mm (1.9 in)	2021-10-25
Saint Ignatius	Record daily precipitation	38.1 mm (1.5 in)	2021-10-25
Big Sur STN	Record daily precipitation	116.8 mm (4.6 in)	2021-10-25

Records per Day

Peak day 525

Records set or tied each day from 20 October 2021 to 31 October 2021. The most in one day was 525 on 25 October 2021.

Records per day during Extreme rain in United States, 20 to 31 October 2021
Date	Records
2021-10-20	5
2021-10-21	33
2021-10-22	71
2021-10-23	37
2021-10-24	223
2021-10-25	525
2021-10-26	205
2021-10-27	160
2021-10-28	265
2021-10-29	89
2021-10-30	36
2021-10-31	6

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 20 to 31 October 2021 ranked by margin
Big Sur STN, 10-25	75.1 mm (3.0 in)
Saint Helena, 10-24	74.4 mm (2.9 in)
Camp Pardee, 10-24	65.5 mm (2.6 in)
Steffenville, 10-24	61.9 mm (2.4 in)
Sutter Hill Cdf, 10-25	58.2 mm (2.3 in)
Maquoketa, 10-25	52.1 mm (2.1 in)
Boca, 10-25	49.5 mm (1.9 in)
Marshalltown, 10-25	47.0 mm (1.9 in)
Piqua, 10-25	42.7 mm (1.7 in)
Sacramento AP ASOS, 10-24	41.6 mm (1.6 in)
Belle Plaine, 10-25	40.1 mm (1.6 in)
Portola, 10-25	37.8 mm (1.5 in)
Peru, 10-25	36.9 mm (1.5 in)
Hill City 1 W, 10-25	36.6 mm (1.4 in)
Philo, 10-25	35.8 mm (1.4 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, 20 to 31 October 2021
Margin (mm)	Years the old record stood
74	107
37	96
38	65
42	59
52	122
47	104
62	104
20	124
40	122
50	59
66	59
43	80
28	80
58	59
23	59
27	59
36	126
37	122
24	76
75	70
87	70
28	71
37	122
33	78
55	2
34	104
36	70
46	64
67	32
37	82
50	74
37	80
34	96
81	70
25	70
51	78
35	71
14	64
42	63
31	82
71	4
22	98
120	59
27	112
33	63
35	112
21	102
19	75
4	141
73	63
22	78
41	59
126	12
67	11
2	112
27	10
28	78
96	54
39	12
20	90
90	42
44	42
30	88
30	80
24	122
39	40
26	103
54	64
26	54
75	70
19	51
24	87
52	44
67	50
63	29
19	70
25	70
33	70
86	12
53	35
50	35
44	78
37	92
22	114
43	39
33	80
27	82
21	122
29	88
21	120
52	30
49	64
20	112
34	87
30	121
28	108
32	104
44	43
55	12
22	51
24	80
11	90
12	75
25	80
18	39
37	80
76	11
7	75
20	17
65	35
54	44
28	74
28	103
21	103
29	92
17	10
36	88
38	40
83	24
11	71
38	5
75	40
64	23
24	70
52	15
36	119
22	16
60	23
30	75
17	103
18	120
19	70
28	56
29	12
35	80
7	80
38	39
6	102
61	19
28	87
16	104
15	122
64	24
47	59
12	70
36	39
15	59
37	54
46	19
59	64
52	44
25	40
43	35
35	78
147	11
124	11
18	70
16	100
41	12
42	72
22	80
20	78
7	90
68	24
20	32
36	32
21	78
44	20
15	100
11	59
18	32
67	30
41	20
31	64
20	96
12	120
31	54
19	122
16	20
22	92
19	24
23	30
52	39
19	78
17	114
29	40
32	24
62	24
28	30
27	46
20	23
77	46
66	39
21	12
14	64
14	47
47	35
41	50
22	112
20	70

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 20 to 31 October 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, 20 to 31 October 2021 (this event)	1,655 records

Every Record Set

20 of 1,655

Every record set or tied during Extreme rain in United States, 20 to 31 October 2021, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2021-10-24	Saint Helena	Record daily precipitation	252.2 mm (9.9 in)	74.4 mm (2.9 in)	107	100 of 100 (Exceptional)
2021-10-24	Sacramento AP ASOS	Record daily precipitation	137.4 mm (5.4 in)	41.6 mm (1.6 in)	59	82 of 100 (Exceptional)
2021-10-24	Steffenville	Record daily precipitation	110.2 mm (4.3 in)	61.9 mm (2.4 in)	104	80 of 100 (Exceptional)
2021-10-24	Camp Pardee	Record daily precipitation	126.2 mm (5.0 in)	65.5 mm (2.6 in)	59	76 of 100 (Major)
2021-10-25	Hill City 1 W	Record daily precipitation	66.3 mm (2.6 in)	36.6 mm (1.4 in)	96	89 of 100 (Exceptional)
2021-10-25	Portola	Record daily precipitation	144.0 mm (5.7 in)	37.8 mm (1.5 in)	65	84 of 100 (Exceptional)
2021-10-25	Maquoketa	Record daily precipitation	70.9 mm (2.8 in)	52.1 mm (2.1 in)	122	80 of 100 (Exceptional)
2021-10-25	Marshalltown	Record daily precipitation	71.6 mm (2.8 in)	47.0 mm (1.9 in)	104	80 of 100 (Exceptional)
2021-10-25	Ely AP	Record daily precipitation	26.7 mm (1.1 in)	20.3 mm (0.8 in)	124	80 of 100 (Exceptional)
2021-10-25	Belle Plaine	Record daily precipitation	65.5 mm (2.6 in)	40.1 mm (1.6 in)	122	78 of 100 (Major)
2021-10-25	Boca	Record daily precipitation	119.9 mm (4.7 in)	49.5 mm (1.9 in)	59	77 of 100 (Major)
2021-10-25	Piqua	Record daily precipitation	69.9 mm (2.8 in)	42.7 mm (1.7 in)	80	74 of 100 (Major)
2021-10-25	Newman	Record daily precipitation	37.8 mm (1.5 in)	27.9 mm (1.1 in)	80	73 of 100 (Major)
2021-10-25	Sutter Hill Cdf	Record daily precipitation	137.2 mm (5.4 in)	58.2 mm (2.3 in)	59	73 of 100 (Major)
2021-10-25	Carson City	Record daily precipitation	71.4 mm (2.8 in)	23.1 mm (0.9 in)	59	73 of 100 (Major)
2021-10-25	Topaz Lake	Record daily precipitation	55.1 mm (2.2 in)	27.2 mm (1.1 in)	59	73 of 100 (Major)
2021-10-25	Philo	Record daily precipitation	47.5 mm (1.9 in)	35.8 mm (1.4 in)	126	72 of 100 (Major)
2021-10-25	Peru	Record daily precipitation	48.8 mm (1.9 in)	36.9 mm (1.5 in)	122	72 of 100 (Major)
2021-10-25	Saint Ignatius	Record daily precipitation	38.1 mm (1.5 in)	24.4 mm (1.0 in)	76	72 of 100 (Major)
2021-10-25	Big Sur STN	Record daily precipitation	116.8 mm (4.6 in)	75.1 mm (3.0 in)	70	71 of 100 (Major)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 1,655 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 2026-10-17. 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
74	107
37	96
38	65
42	59
52	122
47	104
62	104
20	124
40	122
50	59
66	59
43	80
28	80
58	59
23	59
27	59
36	126
37	122
24	76
75	70
87	70
28	71
37	122
33	78
55	2
34	104
36	70
46	64
67	32
37	82
50	74
37	80
34	96
81	70
25	70
51	78
35	71
14	64
42	63
31	82
71	4
22	98
120	59
27	112
33	63
35	112
21	102
19	75
4	141
73	63
22	78
41	59
126	12
67	11
2	112
27	10
28	78
96	54
39	12
20	90
90	42
44	42
30	88
30	80
24	122
39	40
26	103
54	64
26	54
75	70
19	51
24	87
52	44
67	50
63	29
19	70
25	70
33	70
86	12
53	35
50	35
44	78
37	92
22	114
43	39
33	80
27	82
21	122
29	88
21	120
52	30
49	64
20	112
34	87
30	121
28	108
32	104
44	43
55	12
22	51
24	80
11	90
12	75
25	80
18	39
37	80
76	11
7	75
20	17
65	35
54	44
28	74
28	103
21	103
29	92
17	10
36	88
38	40
83	24
11	71
38	5
75	40
64	23
24	70
52	15
36	119
22	16
60	23
30	75
17	103
18	120
19	70
28	56
29	12
35	80
7	80
38	39
6	102
61	19
28	87
16	104
15	122
64	24
47	59
12	70
36	39
15	59
37	54
46	19
59	64
52	44
25	40
43	35
35	78
147	11
124	11
18	70
16	100
41	12
42	72
22	80
20	78
7	90
68	24
20	32
36	32
21	78
44	20
15	100
11	59
18	32
67	30
41	20
31	64
20	96
12	120
31	54
19	122
16	20
22	92
19	24
23	30
52	39
19	78
17	114
29	40
32	24
62	24
28	30
27	46
20	23
77	46
66	39
21	12
14	64
14	47
47	35
41	50
22	112
20	70

Margin (mm)	Years the old record stood
74	107
37	96
38	65
42	59
52	122
47	104
62	104
20	124
40	122
50	59
66	59
43	80
28	80
58	59
23	59
27	59
36	126
37	122
24	76
75	70
87	70
28	71
37	122
33	78
55	2
34	104
36	70
46	64
67	32
37	82
50	74
37	80
34	96
81	70
25	70
51	78
35	71
14	64
42	63
31	82
71	4
22	98
120	59
27	112
33	63
35	112
21	102
19	75
4	141
73	63
22	78
41	59
126	12
67	11
2	112
27	10
28	78
96	54
39	12
20	90
90	42
44	42
30	88
30	80
24	122
39	40
26	103
54	64
26	54
75	70
19	51
24	87
52	44
67	50
63	29
19	70
25	70
33	70
86	12
53	35
50	35
44	78
37	92
22	114
43	39
33	80
27	82
21	122
29	88
21	120
52	30
49	64
20	112
34	87
30	121
28	108
32	104
44	43
55	12
22	51
24	80
11	90
12	75
25	80
18	39
37	80
76	11
7	75
20	17
65	35
54	44
28	74
28	103
21	103
29	92
17	10
36	88
38	40
83	24
11	71
38	5
75	40
64	23
24	70
52	15
36	119
22	16
60	23
30	75
17	103
18	120
19	70
28	56
29	12
35	80
7	80
38	39
6	102
61	19
28	87
16	104
15	122
64	24
47	59
12	70
36	39
15	59
37	54
46	19
59	64
52	44
25	40
43	35
35	78
147	11
124	11
18	70
16	100
41	12
42	72
22	80
20	78
7	90
68	24
20	32
36	32
21	78
44	20
15	100
11	59
18	32
67	30
41	20
31	64
20	96
12	120
31	54
19	122
16	20
22	92
19	24
23	30
52	39
19	78
17	114
29	40
32	24
62	24
28	30
27	46
20	23
77	46
66	39
21	12
14	64
14	47
47	35
41	50
22	112
20	70

Margin (mm)	Years the old record stood
74	107
37	96
38	65
42	59
52	122
47	104
62	104
20	124
40	122
50	59
66	59
43	80
28	80
58	59
23	59
27	59
36	126
37	122
24	76
75	70
87	70
28	71
37	122
33	78
55	2
34	104
36	70
46	64
67	32
37	82
50	74
37	80
34	96
81	70
25	70
51	78
35	71
14	64
42	63
31	82
71	4
22	98
120	59
27	112
33	63
35	112
21	102
19	75
4	141
73	63
22	78
41	59
126	12
67	11
2	112
27	10
28	78
96	54
39	12
20	90
90	42
44	42
30	88
30	80
24	122
39	40
26	103
54	64
26	54
75	70
19	51
24	87
52	44
67	50
63	29
19	70
25	70
33	70
86	12
53	35
50	35
44	78
37	92
22	114
43	39
33	80
27	82
21	122
29	88
21	120
52	30
49	64
20	112
34	87
30	121
28	108
32	104
44	43
55	12
22	51
24	80
11	90
12	75
25	80
18	39
37	80
76	11
7	75
20	17
65	35
54	44
28	74
28	103
21	103
29	92
17	10
36	88
38	40
83	24
11	71
38	5
75	40
64	23
24	70
52	15
36	119
22	16
60	23
30	75
17	103
18	120
19	70
28	56
29	12
35	80
7	80
38	39
6	102
61	19
28	87
16	104
15	122
64	24
47	59
12	70
36	39
15	59
37	54
46	19
59	64
52	44
25	40
43	35
35	78
147	11
124	11
18	70
16	100
41	12
42	72
22	80
20	78
7	90
68	24
20	32
36	32
21	78
44	20
15	100
11	59
18	32
67	30
41	20
31	64
20	96
12	120
31	54
19	122
16	20
22	92
19	24
23	30
52	39
19	78
17	114
29	40
32	24
62	24
28	30
27	46
20	23
77	46
66	39
21	12
14	64
14	47
47	35
41	50
22	112
20	70